Chaos Computer Club - recent events feed

"Ich orchestriere Datenflüsse", das sag ich, wenn mich öpper fragt, was ich denn bei Meteotest mache. Denn von überall kommen Daten rein: Satellitenbilder, Messwerte von Wetterstationen, Bilder von Strassenwetterkameras, hochaufgelöste Wettermodelle, Regenradar, kurzfristige Wetterprognosen, Messwerte von Schadstoffmessungen. Diese Datenflüsse wollen nicht nur verarbeitet, sondern auch überwacht, archiviert, weitergeleitet, angezapft, und bespielt werden. Bei uns geht das alles über einen Messagebroker. Manche der verschickten Messages sind mehrere hundert Megabytes gross! Dürfen wir das? Und was passiert, wenn Systeme dazukommen und weggehen, oder ausfallen? Wie füttern wir Testsysteme mit reellen Daten? Ist Apache Artemis mit Apache Camel die Erlösung? about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/22276653-7f42-55e5-b0f9-9143f4173e5b/

DevOps for hardware: Automate your PCB production process with KiCad CLI, Forgejo and Git Are you using KiCad to design printed circuit boards? Do you want to simplify your production process and keep your project's web site updated on the side? Then this presentation might be for you. I'm using self-hosted open source tools exclusively in this presentation, but the process is easily adaptable to other source code hosting services. In fact, there's also a (sort of) official way to do this, but building a processing pipeline yourself is more fun, and it's surprisingly easy if you're already familiar with the tools. I will present a small KiCad project of mine and show how I built a workflow with Forgejo actions that produces PCB production files and 3D renderings (this feature is available since KiCad 9.0) from the board files. It also runs ERC and DRC verifications, which can be helpful for catching last-minute mistakes. The 3D renderings are displayed in the project's readme file. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/cab1c502-a96a-53e3-be9f-9f3473139ddc/

Goodbye. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/1063027656/

Digital tickets from traffic associations are often stuck inside their proprietary walled garden apps. But the neat thing about digital tickets, is that the barcode can be shown anywhere, and still be valid. This talk documents my efforts to reverse engineer various traffic association's apps, and my work on Zügli to make tickets without tracking available to all. Semestertickets are great - travel throughout Germany included in your University fees. Unfortunately, many Universities have partnered with traffic associations that require you to use their app to access your ticket. These apps are full of tracking, advertising, and don't always have the best security practices. Not to mention that they only work inside Google or Apple's proprietary walled gardens - there's no way to get these apps to work on Huawei phones, or without handing over your data to Google through their Play Services. The neat thing about digital tickets though, is that it doesn't matter how it's displayed. As long as the ticket controller can read the barcode on your ticket, you have a valid ticket. A ticket on a piece of paper would be equally valid, and secure - however these are forbidden for political reasons. Therefore, the ticket must be shown on a digital device of some kind, but it need not be the app of the company or association that issued it. There exist many free, open source, and privacy respecting apps that support displaying the de facto industry standard PKPass files for digital tickets. One merely has to get their ticket into such a format. The apps of the respective traffic associations, by their nature, must download the ticket to the device somehow. So, what's to stop us from doing the same, only outwith the app? Absolutely nothing! This talk documents the process of reverse engineering several traffic associations' apps, how some of them try to frustrate this, how some of them make careless security mistakes, and how you can free your transport tickets from proprietary apps with Zügli. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/e5080bf2-6e4e-5c74-a32e-6c7fe2fc1431/

Machine embroidery is becoming increasingly popular. It is more durable than other customization methods for textiles and it adds a whole new artistic dimension to the design. What makes it so beautiful, also adds a new layer of complexity to the machine embroidery design creation process. In this brief introduction we will learn a few basic essentials on how to create machine embroidery designs using the Open Source vector graphic software Inkscape along with the Ink/Stitch extension. ## Links * [Ink/Stitch](https://inkstitch.org/) * [Inkscape](https://inkscape.org/) Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/2052117469/

The illumos Communities are many and mostly unknown. In this talk I will show you the people and groups involved and their goals and why we do things the way we do. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/d6f9ef78-ce2a-5cc9-9e7f-568b5aca6859/

Organising a film festival is 90% communication. The FOSS and Libre Graphics toolbox is well-equipped for this. However, for many of the tasks that a festival entails (video formats, subtitles), we needed to dig a little deeper. Hear about the challenges we faced and the solutions we came up with! ## Links * [website: LusOFest](https://www.lusofest.de) Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/2743934851/

… using Qgis and Scribus with a little help from Inkscape, and Ghostscript. ### A happy-ending story about finding out the tips and tricks along the way. Last November, we've been comissioned to produce a small series of printed maps for a cultural center in Lessines, Belgium, to celebrate memories of Louis Scutenaire and René Magritte. We aimed for a project using three colors, and decided to go for spot color printing - using libre graphics tools, mainly QGIS for the design of the map, and Scribus for layout elements and to prepare the pdfs for printing. We also used Inkscape to vectorize some small illustrations, as well as Ghostscript to check and sometimes fix the resulting PDFs. Then, once we decided that it would be spot color printing, we had to find out a workflow from QGIS to Scribus in order to produce PDFs for spot-color printing. It was not without a few obstacles that we encountered, as both QGIS and Scribus present limitations in terms of color processing or vector rendering. We will present our productive investigation into both QGIS and Scribus, describe how we use QGIS functionalities to optimize the maps for spot color printing and show the tips and tricks we learned along the way - and share the results, hoping to inspire other mapmakers around to give it a try.  Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/1308567759/

TypeRoof is **type tooling infrastructure**. It provides type proofing applications, initially based on Video Proof and Variable Type Tools. Now it also explores the world of general animation with type as a principal actor, and document creation with general typography in mind and typographical automations based on expert knowledge. TypeRoof is **intended as a host** for all kinds of type related tools, providing advanced methods of resource loading (i.e. fonts, data files) saving and restoring state etc. – features which ad-hoc developed tools typically miss out, as they are hard to do right on limited time. TypeRoof is **Free/Libre Open Source Software and web based**, build mainly with vanilla JavaScript and a few specialized dependencies. We are looking for a community of users and developers who are interested in shaping its future. ## Links * [website: TypeRoof](https://fontbureau.github.io/TypeRoof/docs/) * [git](https://github.com/FontBureau/TypeRoof) Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/622685393/

This presentation explores UI improvements for Inkscape, aiming to make it more welcoming for newcomers while enhancing efficiency for experienced users. It showcases design concepts, feedback from the UX team, and discusses how UI refinements can strengthen Inkscape's community. ## Links * [Inkscape](https://inkscape.org/) Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/2407556856/

In early 2024, a friend pointed out that an interesting Laptop is available in a swiss webshop at a rather low price. This machine is the Clevo L140CU, which is noteworthy because it is also sold by System76 with open-source firmware. What follows is a story of open firmware, dodgy flashing setups, lost hardware and maybe a working laptop in the end. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/56bc40ed-bc3f-58b6-acb6-cb46ea538c43/

Während der Rest der Welt mit der Einführung von IPv6 beschäftig ist, habe ich versucht, IPv4 in meinem Heimnetz abzuschalten. In diesem Vortrag erzähle ich, wie gut das in der Praxis funktioniert hat. Wenn in einem Netzwerk IPv4 abgestellt wird, geht zunächst einmal sehr viel nicht mehr. Unter anderem können z.B keine Webseiten mehr erreicht werden, die nur via IPv4 erreichbar sind, darunter z.B. Github. Um aus einem "reinen" IPv6-Netz heraus auch das Legacy-Internet erreichen zu können, benötigt es verschiedene Übergangstechnologien. In diesem Vortrag erzähle ich, wie man diese und weitere Übergangstechnologien auf einem Linux-Router einrichtet, was für Probleme dabei auftreten, welche dieser Probleme lösbar sind, und welche Dinge einfach nicht funktionieren. Ein (sehr kurzes) IPv6-Intro gibt es am Anfang auch noch, sodass dem Vortrag auch ohne viel IPv6-Vorwissen gefolgt werden kann. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/1ff89037-2ba8-5c13-9da4-e2e0c74ea5e2/

So, is LGM all about libre tools that software developers make that designers and artists use to make creative work … ? At previous LGMs we’ve talked about open-source design feeding back into improving the look, feel and usability of creative software. But what about the tools used to write those tools? Can we link things back another step? Coding environments have barely changed in decades. Yet the complexity of software produced in them has risen exponentially. The disconnect from cause to effect has become ever greater. All software has bugs, most bugs involve software doing exactly what it was told to do. Sometimes they eat your work, sometimes they kill people. The title of this talk is partly “borrowed” from an article that appeared in The Atlantic in 2017. But is it all hyperbole? This talk was originally proposed for the cancelled LGM in 2020 - the landscape may have evolved since then, such as in the growth of AI, but has it improved? Let’s consider some of the issues. And ongoing experiments in user interaction, liveness and design in various open-source tools that are seeking to change coding for the better. This talk may cover some of the ideas in play. But it certainly won’t have the right answers. It probably hasn’t even found the right questions. But just maybe it’s time to help save the world from code. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/2351779594/

In this presentation, we partly follow this year's topic "RE:imagination" and will explore old but not old-fashioned printer control languages such as HP-GL (1970s and 1980s) and PostScript (1980s) and device-specific commands for dot matrix printers (1980s) to better understand how we relate to printers and printing today. What can we learn from these languages from current graphic practices and perspectives? What context were these languages developed in? Which aesthetics can be created with them today and which tools are needed to do so? How can the sharing culture of the FLOSS/LGM community be applied to such old "closed source" devices? This artistic, media archeological, and auto-ethnographic research is part of the Master Experimental Publishing (XPUB) in Rotterdam, where we, students and teachers, studied these languages together in the first 3 months of this year on the most obsolete and almost discarded printing devices of our university. Expect a presentation about frustrations with serial connections, dust removal with compressed air, porous plastic that disintegrates into small pieces, glitch aesthetic with PostScript and the practice of working within the obstacles of dying devices. Watch out for undead pen plotters & printers and their obscure languages! Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/621783192/

A developer talk about coming up with a new file format for [Drawpile](https://drawpile.net/) with the focus being on the findings and ideas that would be useful for other programs as well. Some of those ideas are already implemented and have brought a massive speedup in file saving and loading, some wilder ideas like continuous autosave with history-altering time-travel are in various states of currently still being worked on, but sufficiently cool to talk about anyway. ## Links * [Drawpile](https://drawpile.net/) Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/2882617605/

IT ist eine Abkürzungshölle. Allein im Kontext "E-Mails": Von IMAP, SMTP, POP und MAPI einmal abgesehen, haben wir (ITler) DNSBL, SPF, DKIM, DMARC und BIMI in den letzten Jahren freiwillig oder unfreiwillig nach RFC implementiert. In diesem Vortrag geht es darum, dass die IT-Branche seit Jahren immer mehr Pflästerli auf die teilweise 30+ Jahre alten Protokolle klatscht und alle diese Dinge am Schluss dran scheitern, das Firmen diese Aufwände zunichte machen, in dem Sie ihre eigenen, oder die Benutzer anderer Firmen zu gefährlichem Verhalten trainieren. Wir Menschen in der IT-Sicherheit lassen nichts unversucht - um unsere Benutzer:innen und die Firmen die uns dafür entlöhnen oder denen wir vertraglich dazu verpflichtet sind - zu schützen - Das Resultat davon: Wir haben bereits so viele Sicherheits-Schichten, es scheint fast als bauten wir am Turm zu Babel. Währenddessen arbeitet das "Business" - also die Wertschöpfungsketten der Wirtschaftswelt stetig daran, dies rückabzuwickeln. Trotz aufwändigster E-Mail Betrugsschutz-Mechaniken und passwortloser Authentifizierung, klicken Menschen im operativen Geschäftsalltag immernoch auf Phishing-Links - öffnen Sie Anhänge obwohl Sie es vermeintlich besser wüssten. Weshalb? Weil Bad Practices alltäglich sind und träge - schleichende Erneuerungsvorgänge von Budgetcuts und AI-Versprechen behindert werden. Wie so etwas ausschaut, und wie ironisch dies im Gesamtkontext ist - soll dieser Vortrag aufzeigen. P.S: Freut euch auf VMC, das nächste "Geld gegen Vertrauen"-System welches das Problem nur begrenzt lösen wird. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/20f91cff-ca0a-527d-a43a-4e15718a8c3a/

Five 10 minute slots for lightning talks. Sign-up on location! Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/2582991739/

The GNU Taler payment system is live in Switzerland. In this talk we'll go over why that should matter to you, and what you can do with the system. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/64f47e73-732e-5042-90a5-f4844cb09899/

The session will start with an introduction to the topic of usability and user experience (UX), including the human centered design process (HCD) and design thinking (DT). After having laid out the foundation, a brief overview of different usability evaluation methods is given. The main part of the presentation is about introducing two often used methods: On the one hand the heuristic evaluation as an example of a usability inspection method, and usability testing on the other hand. Both methods can be used to find (potential) usability problems in a software. Whereas a heuristic evaluation is conducted by an expert following a check-list, a usability test needs end users who fulfill tasks to be conducted. After describing how both methods can be used individually, also a practical way to combining them is presented. The session will conclude with an overview of the advantages and disadvantages of each method. ### Three takeaways of this session will be: * A basic awareness for usability/UX and the importance of evaluating it * An overview of the two major usability/UX evaluation methods heuristic evaluation and usability testing * A first idea how to use these methods for your/a software project ## Target group * UX/usability laymen * Contributors to software Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/4264988911/

Fontra is a novel, libre, browser-based, cross-platform, variable-first font editor. ## Links * [website: Fontra](https://fontra.xyz/) Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/64122622/

Come learn about some ways to create waterfalls for video games! Inspired by a variety of waterfalls in the Pacific Northwest of the USA, Tom has been playing around with different ways to create waterfalls in the open source Godot game engine, with the help of other open source software such as Blender, Krita, and Gimp. Video game fluid flow is a complex subject, and this talk will outline various methods to cheat so that you don't really have to know complex math to make something acceptable. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/3330112692/

Hubs is an open-source interactive browser based 3D meeting space. It is now fully integrated in Blender 3D, which is using an extended version of the gltf format. An extension allows you to attach all the basic components to objects, like particles, UV animations, water and much more. But you can also share links, videos and audio right inside your 3D rooms. Soon another feature was added to the gtlf exporter, the Behavior Graph. It enables interactivity via node-based logic and is only available in Blender 3D. It is the very feature we would like to present to you. If you are used to Blender’s nodes graphs, you might feel right at home. However managing interactivity creates a distinct difference, since every node needs to get triggered by events, be it player interaction or just timer based.  Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/3725599921/

A lot of CPU cycles have been spent on deep learning based machine learning models. But there are some unreasonably effective, very stupid methods that can be surprisingly effective. One of these methods are random projections, which we will explore for anomaly detection on some real-world data from the CMS experiment at CERN. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/f77a03cf-23bb-59b7-9605-2c4944cc97c0/

[Hyper 8](https://simonrepp.com/hyper8) is a static site generator for video, developed since 2023 and first released in 2024. It uses a file-based, modular building block system for authoring video sites ranging from single videos, to playlists, to video collections of arbitrary hierarchical complexity. Sites can be created and edited using Hyper 8's graphical user interface, but also using nothing more than a terminal, file explorer and text editor (or both). Due to their static nature, Hyper 8 sites are inherently fast, maintenance-free, long-term archivable (also working offline without a server, directly off disk) and compatible with pretty much every webhost (thereby easy to publish and move). In this talk I want to take you on a whirlwind tour around the project: Who is this for? What was the motivation? How does this relate to PeerTube? What is being developed at the moment? Where is it going in the future? What are the challenges, learnings, anecdotes so far? And so on. And of course also: Your questions! ## Links * [Hyper 8 Video System](https://simonrepp.com/hyper8) Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/1785153121/

Termux ist ein Open-Source Terminal Emulator und eine Linux Umgebung für Android. Die App lässt sich ohne spezielle Anforderungen direkt von F-Droid installieren. Mit dem gebündelten Paketmanager 'APT' lassen sich, auf eine für Linux User gewohnte Art, viele bekannte Linux Programme installieren. Der Vortrag wird eine Übersicht von Termux mit seinen Komponenten und Funktionen umfassen plus eine ganze Menge Beispiele, wie man Termux nutzen kann, und für was es sich als ultraportables System besonders gut eignet. Glow nutzt Termux seit 2015. Er selber hat viele Programme paketiert und an grundlegenden Komponenten mitentwickelt. Er setzte das Termux Wiki auf und betreut es bis heute. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/0613fcae-5299-5ecb-a08d-1047ceeb0f89/

It is well known that PDF has become a very popular file format. Everyone use it everyday for many purposes. In this context, many software can produce PDF. Still, as graphic designers, we must often deal with provided PDF that doesn’t match our needs, because one PDF isn’t worth another. On the other side, printshops also come with their own standards and constraints. How can we deal with theses everyday outcomes and be sure our PDF will match the delivery standards, using only free softwares? In this presentation, we will talk about several PDF tools trying to reach this goal of giving the right PDF to the right person. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/1886762777/

At the 2014 edition of LGM in Leipzig I've shown the evolution on printed circuit board design with a special focus on fonts, which were mostly constrained by the technical capabilities of the tools available at that time. Ten years later, however, there now is a strong Free Software option for designing your own PCBs and there is a growing community of artists using PCBs as a medium for artistic expression, a lot of them actually using KiCAD for the design work. I want to showcase examples of PCBs where the properties of PCBs are used to create visually appealing hardware. I'll also give a quick tour through KiCAD to show the limits of its capabilities as well as its strong side for graphical artworks. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/12740338/

E-Collecting verspricht, die direkte Demokratie ins digitale Zeitalter zu führen – effizienter, zugänglicher, datenschutzfreundlicher. Doch was passiert, wenn technische “Lösungen” neue Hürden schaffen oder alte Probleme lediglich digitalisieren? Dieser Vortrag beleuchtet die Entwicklungen rund um das Pilotprojekt E-Collecting in der Schweiz, inklusive Schreibroboter im Bundeshaus, E-ID-Einsatz und den politischen Hintergründen. Dabei diskutieren wir kritisch: Welche Probleme werden tatsächlich gelöst – und welche verdrängt? Wie sinnvoll ist der eingeschlagene Weg aus Sicht der Demokratie, des Datenschutzes und der Teilhabe? Und was sagt es über unsere politische Kultur, wenn eine Briefkastendemokratie an ihren eigenen Hürden scheitert? Ein Vortrag für alle, die Technik nicht nur anwenden, sondern auch hinterfragen wollen. In einer Zeit, in der digitale Prozesse zunehmend auch die demokratische Partizipation beeinflussen, wirft E-Collecting zentrale Fragen auf: Was bringt der Einsatz von E-ID, QR-Codes und digitalen Plattformen beim Sammeln politischer Unterschriften wirklich – und für wen? Am Beispiel aktueller Pilotprojekte und politischer Vorstösse zeigt dieser Vortrag, wie technische Mittel wie ein Schreibroboter im Bundeshaus zwar Aufmerksamkeit erzeugen, aber grundlegende strukturelle Herausforderungen wie Datenschutz, Zugangshürden und Vertrauen in den Prozess nicht automatisch lösen. Wir werfen einen Blick auf technische, gesellschaftliche und politische Dimensionen: von “Unterschriftenbschiss” über steigende Sammelkosten bis hin zur Frage, wie offen, zugänglich und freiwillig digitale Beteiligung überhaupt sein kann – und soll. Eine Einladung zum Mitdenken, Mitdiskutieren und vielleicht sogar zum Mitgestalten. about this event: https://fahrplan.cosin.ch/fahrplan/2025/events/0fc52c19-6491-5226-b765-629554851203/

Five 10 minute slots for lightning talks. Sign-up on location! Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/1566315690/

Whether it is stitching together some travel footage or producing high-quality film content, there are many ways people want to work with the medium "video". Their needs for video editing solutions are diverse, and so is their budget. Open-source video editing software seems great for beginners to get started at zero cost. What do you get and what do you have to give up on compared to the closed-source options? What does it even take to build software like this from scratch, technologically as well as mentally? This talk takes a brief look at the free-to-use options for video editing on a desktop computer before switching the perspective to that of the developers and maintainers of such software. It offers insights into the struggles with technology, fundraising, self-motivation, and community dynamics, while also highlighting the rewarding moments and intriguing current and future developments. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/504479317/

Images created with digital graphic techniques have played a central role in promoting the seemingly endless growth of a computing culture that many of us now recognize as extractive, polluting and exploitative. Beyond that, something that once promised a utopian future now feels like it has delivered a rather crappy, disappointing reality. FLOSS has undoubtedly played some role in this development, but it also holds a great potential as part of a shift in imagination to new practices and aesthetics that are more verdant, just and humane. This presentation will propose the concept of "Permacomputing" as a useful lens to consider the role of FLOSS in developing alternative practices. Permacomputing is both a concept and a community of practice oriented around issues of resilience and regenerativity in computer and network technology inspired by permaculture. We will start with a brief introduction to the concepts and emerging projects around these ideas. With these notions in mind, we can then examine how some of the existing practices of Libre Graphics might inspire or give relevant support to newer, more holistic ways of working. And finally, we will look at some specific examples of software development, education and image making using the generative flora of computing within limits. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/4048563567/

Splines, especially in their general form as NURBS, are an extremely versatile tool in a 3D designer's kit. They allow the designer to succinctly and efficiently model objects of arbitrary shape and smoothness. For converting these designs into physical objects, FreeCAD has a vast set of tools to operate on NURBS, both as planar curves and (with addons) as surfaces. However, the complications of NURBS can also cause a good amount of confusion, especially compared to other representations of splines, which may be more familiar to the user from other applications (which may include other CAE apps as well as more artistic tools like Inkscape). In this talk, I discuss some of these common questions often seen in the issue tracker and forums, as well as best practices to follow for common workflows. I also showcase current progress and future plans to make the experience more intuitive and in line with other apps. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/3097564238/

Scalable vector fonts have been the norm for decades, but that doesn't mean artists and hackers don't have use cases where a bitmap font fits the bill (and it doesn't mean that classic bitmap font designs deserve to be forgotten, either). This session explores two distinct scenarios where bitmap fonts have a role to play and looks at the tooling needed to convert or repackage older bitmap formats for convenient usage in modern free-software applications. The first scenario is enabling vintage computing aesthetics in graphic design: there are several paths available to transform bitmap fonts into forms usable in Inkscape, GIMP, and other open-source design tools. The second scenario is getting text onto inexpensive LCD, LED, and OLED display hardware. Most such display hardware allows the runtime loading or flashing of bitmap characters, but pitfalls abound. Options and recommendations for both scenarios will be examined, with demos drawn from vintage arcade fonts and the classic Xorg/X11 font suite. To conclude, the talk will outline the licensing issues likely to arise when dealing with bitmap font packages that so often predate contemporary free-software licenses. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/4042669152/

UpStage, the artist-led platform for cyberformance (live online performance), celebrated its 20 th anniversary in 2024 along with the completion of the four-year Creative Europe funded artistic project Mobilise/Demobilise. This project enabled a complete “RE:imagination” of the UpStage code, removing its dependency on Flash, introducing new features and bringing it up to date with current technologies. The last time we presented UpStage at LGM, in 2021, we had just begun this process; since then, the new platform has been launched and development is ongoing. In this presentation, our Lead Developer Gloria W. and UpStage Persister Helen Varley Jamieson will present the new platform and its features including its integration of Jitsi for audio-visual streams, audience interaction and live text and drawing tools. Most recently the developers have implemented Docker and made other improvements to the backend, to make installation of independent instances easier and testing more automated. Alongside the development work, UpStage continues to actively promote the use of open source tools by artists, and the involvement of artists in the development of our digital tools. This is ever more important as LLM (so-called AI) and the increasing hegemony of proprietary social and creative platforms force artists into their paradigms. UpStage continues to be an independent, artist-led space for the “RE:imagination” of better worlds. ## Links * [UpStage](https://upstage.org.nz/) * [UpStage: the cyberformance platform](https://upstage.live/) * [Mobilise/Demobilise](https://mobilise-demobilise.eu/) Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/1998122706/

Processing is one of the most widely used open-source tools for creative coding and CS education. Since it was first released in 2001, it has been instrumental in teaching coding to students, artists, and designers worldwide, serving as a gateway into programming for people who might never have touched code otherwise. A remarkable thing about Processing is the consistency of its API. Most Processing code written twenty years ago still runs in Processing today with only minor changes. That kind of longevity is rare in software and speaks to the project's thoughtful design. But behind the scenes, the project has been struggling. For a long time, Processing relied on a small, dedicated core team. As contributors moved on, fewer people remained who understood the full complexity of the codebase. Maintenance became harder. Key libraries stopped working. By the time Processing 4 was released, the project was already in a difficult place. In 2021, a major fundraiser for Processing’s 20th anniversary brought unprecedented financial support, but it also sparked difficult conversations about the project’s future. In 2023, Processing’s historical maintainer, Ben Fry, cut ties with the project, and with no clear direction, development stalled for over a year. Many assumed Processing was dead. It is not. That same support that brought uncertainty also made recovery possible. Over the past year, a small group of contributors, with support from the Processing Foundation, has restarted development, modernized infrastructure, and begun the slow, difficult work of making Processing a sustainable open-source project again. Processing will turn 25 in 2026, and we’re working to make it last for another 25 years! This talk is an honest look at what it takes to keep a beloved open-source project alive, the progress we’ve made, and why the community’s role in its future is more critical than ever. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/3247239903/

An update from the many projects of our community. ## Submit Slides and Content Please submit your slides as Pull Requests to https://github.com/libregraphicsmeeting/state-of-lg-2025 details to the format and process are in the README of the repository. If you have trouble contributing this way, feel free to contact us directly: [[email protected]](mailto:[email protected]). ## Call for Slides The public announcement is at: [Call for Slides: State of Libre Graphics](/news/2025-05-06_0001-call-for-slides-state-of-libre-graphics/). Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/1718866582/

We're kicking of this years special focus -- RE:imagination -- exploring the possible futures of the Libre Graphics Meeting. ## TODO: Keynote? This may be a placeholder for a keynote, that still needs to be determined. ## Special focus – RE:imagination The Libre Graphics Meeting faced significant challenges during and after the pandemic. In [Rennes](/2024), France, 2024, the local organization team revitalized the event, and now we aim to rebuild the international community and strengthen the structures around the Libre Graphics Meeting. Join us to reconnect with old friends and forge new connections. Under the theme of **RE:imagination**, we are going to explore the future of the Libre Graphics Meeting together. Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/269522426/

Welcome to Nuremberg, welcome the Libre Graphics Meeting! Licensed to the public under https://creativecommons.org/licenses/by/4.0/ about this event: https://pretalx.c3voc.de/lgm25-upstream-2025/talk/2682810148/

Zur Lage der Bürger- und Menschenrechte in Deutschland Am Dienstag, den 23. Mai 2023 um 10 Uhr wurde in Berlin der neue Grundrechte-Report vorgestellt. In seinen 38 Beiträgen zeigt der alternative Verfassungsschutzbericht erneut auf, wie Gesetzgebung, Verwaltung und Behörden, aber auch Gerichte und Privatunternehmen die demokratischen und freiheitlichen Grundlagen unserer Gesellschaft gefährden. Link: https://www.fiff.de/veranstaltungen/grundrechtereport2023 about this event: https://www.fiff.de/veranstaltungen/grundrechtereport2023