Exhibitors

Bareos (Backup Archiving Recovery Open Sourced) is a network-based open-source backup solution (licensed under AGPLv3) that backs up, archives and restores data from all common operating systems. There are a number of plugins that, in addition to reliably backing up files, also enable the backup of various database servers (PostgreSQL, MariaDB, MySQL, MSSQL), LDAP directory services, cloud storage and virtual machines (VMware, oVirt, Proxmox, Hyper-V, Incus).

CAcert is a community-driven Certificate Authority moved to Switzerland in 2024 issuing certificates to the public at large for free. We're issuing server certificates as well as client certificates.

Obviously there will be experienced Assurers at our booth to prove your identity towards CAcert by an ID-card or passport.

This year we'll show how the CAcert-solution works with OpenIDConnect-capable software software like Wordpress or how to implement it to your own software using PHP, Perl and (maybe) Python. This new functionality is be available to every verified CAcert-member.

Delivering at the speed of Chaos

To all entities inside or outside of Chaos events. We only accept postcards. We do not deliver letters. We do not accept packages of any size. We do have different postcards on site.

Remark: It's not the full-featured ChaosPost, we could only provide a subset at Froscon, so delivery will take some more time.

The chr terminal editor is inspired by the turbo pascal editor using Turbo Vision from the year 1997. For the keyboard shortcut he should be similar gedit, to facilitate the transition from desktop to console editor.

You are wondering which CMS is the best – or the best suitable for you? Find all the relevant open source CMS in one place: compare and decide. Brought to you by the communities themselves - welcome to the Garden where all the plants grow peacefully side by side!

Collabora Office and Collabora Online (often abbreviated as COOL) are open-source office suite developed by a community led by Collabora, and based on LibreOffice. Both are using web technologies as frontends for the underlying LibreOffice-based codre. With that, real-time collaborative editing of documents, spreadsheets, presentations, and vector graphics in a web browser and on desktops are enabled. The primary platforms are Linux (server and desktop), macOS and Windows. Furhter ports are available for offline use on Android, ChromeOS, iOS, and iPadOS. It supports the OpenDocument format and is compatible with other major formats, including those used by Microsoft Office. Collabora Office is used in a wide variety of open source file sharing and workflow applications, such as XWiki, Nextcloud, OpenCloud, and openDesk.

CrypTool offers knowledge about cryptology and free tools to self-educate and to teach about cryptology. We are GDPR-compliant and don't collect personal data.

Our subprojects:

CrypTool-Online (CTO) offers you many online apps to experiment with concepts of cryptology. Ciphers, codings, cryptanalysis, and games. Easily in your browser.

CrypTool 2 (CT2) is the successor of the famous CrypTool 1. You can use it to visually connect a whole range of cryptologic components to see how they work together and to build your own workflow.

MysteryTwister is an online contest that offers you cryptological puzzles. There are four levels: I is for beginners, II gets a little harder, III is really hard, and the solutions to X are mysteries! Find out.

Teach cryptology in school
Learning course for 11th grade
Especially created for the 11th grade of Bavarian schools. Gives you a step-by-step introduction to codings and ciphers, with tasks to prove your understanding.

Decipher historical manuscripts
CrypTool Transcriber & Solver
George Lasry contributed a Java tool that you can use to transcribe and cryptanalyze historical encrypted manuscripts. For historians and linguists interested in cryptology.

And some more ... which you can find with detailed descriptions on our website.

The German-speaking TeX Users’ Association (Deutschsprachige Anwendervereinigung TeX e.V. – Dante –) is a non-profit association founded on 14 April 1989 in Heidelberg. Dante supports TeX users throughout the German-speaking world.

We provide support with the selection and installation of TeX, LaTeX and ConTeXt, help users and developers to resolve issues, and distribute TeX software. In addition, we provide information on all aspects of TeX and LaTeX through our books, mailing lists and forums. This also includes participation in trade fairs and other events, numerous websites we support featuring TeX Live systems, forums, FAQs and advisory services, and, last but not least, our association’s magazine, *Die TeXnische Komödie*.

With the Comprehensive TeX Archive Network (CTAN), which contains around 7,000 packages from more than 3,100 authors (as of April 2026), we provide the central distribution point for TeX-related software on the internet.

Furthermore, Dante e.V. provides both personnel and financial support at national and international level for developments in the fields of TeX, LaTeX, ConTeXt, LuaTeX, Metafont, Bib(La)TeX, fonts and much more.

Datenburg e.V. is a hackspace and the "Chaostreff" of Bonn. We are a community of people who find science, technology and digital art exciting. We discuss net-political and social topics, work together on projects, organize workshops and lectures on topics that interest us, and much more.

When John Alexander shared his idea of using piezo elements from everyday devices like fire alarms and greeting cards as actuators for scanning tunneling microscopes, he demonstrated that nanoscopic measurement techniques can be explored by anyone curious enough.
This project exists to consolidate the scattered knowledge and parts needed as well as to preserve the documentation and everything needed to build your own.

The Electro Beer Software Distribution (ElectroBSD) is an experimental operating system designed to
be used in hostile environments like Germany.

ElectroBSD is (supposed to be) free software but due to
unresolved license issues it is currently only released as patchset
against the non-free uptream.

F-Droid is an app store for Android devices with thousands of apps, all of them Free Software.

F-Droid consists of:

• an official repository exclusively containing Free Software

• a client app which makes it easy to download additional apps

• a friendly community that meticulously maintains and develops this software ecosystem.

Fedora is a Linux distribution sponsored by Red Hat and governed by the Fedora community. It works as an upstream for CentOS, Red Hat Enterprise Linux, Alma Linux, Bazzite and other distributions.

Fedora offers a range of artifacts: Fedora Workstation Edition for Gnome desktop users, Fedora KDE Edition for KDE desktop fans, Fedora Atomic images for image-based use cases, or Fedora Server Edition for cloud and server scenarios. There are also Fedora Labs, Spins and Remixes for other applications.

Our guiding principle is Upstream First. And our core values are Freedom, Friends, Features and First.

Flatcar is a fully open source, community-driven, minimal-footprint, secure by default and auto-updating Linux distribution for running containers at scale.

FlorisBoard is an open-source keyboard for Android 7.0+ aiming at providing a feature-rich and modern touch keyboard. Currently being in beta, it already offers many layouts, a powerful theme editor, custom font support, a clipboard history including image/video support, a floating window mode, and many more customizable options. In addition to that FlorisBoard is working on k3lp, which allows to parse and run Unicode Keyboard3 files, which then also paves the way for customizable keyboard layouts within the app settings.

The Free Software Foundation Europe is a charity that empowers users to control technology.

Software is deeply involved in all aspects of our lives, and it is important that this technology empowers rather than restricts us. Free Software gives everybody the rights to use, understand, adapt, and share software. These rights help support other fundamental freedoms like freedom of speech, press, and privacy.

The FSFE helps individuals and organisations to understand how Free Software contributes to freedom, transparency, and self-determination. It enhances users' rights by abolishing barriers to Free Software adoption, encouraging people to use and develop Free Software, and providing resources to enable everyone to further promote Free Software in Europe.

The Genode OS framework is an operating-system technology created from scratch. Being a component-based system designed after the principle of least privilege from the very beginning, it breaks with many concepts that we take for granted in traditional operating systems. Instead, Genode introduces a novel way of composing system scenarios out of building blocks where the building blocks are able to cooperate without ultimately trusting each other. Those building blocks include not only applications but also all classical OS functionalities including kernels, device drivers, file systems, and protocol stacks.

In particular, these principles are showcased by Sculpt OS, a Genode-based general-purpose OS. Since it is not derived from any existing OS, Sculpt re-approaches established concepts like the installation, configuration, and program spawning from a new angle. This is reflected by its custom user interface.

At FrOSCon 2026 we would like to showcase the significant progress the Genode team has made a during the past year.

Förderverein Gentoo e.V. represents the Gentoo Linux project in Germany and all of Europe, and provides resources for users, developers, and events.

We pursue the following objectives:
- Development and promotion of the free Gentoo Linux distribution
- Presentation of the Gentoo Linux project through public meetings, conferences and informational events
- Supporting members and non-members in the development and use of free software
- Public relations activities using all media channels
- Collaboration and exchange with national and international groups whose goals are compatible with those of the association

GNU/Linux.ch is a joint project by the community for the community. We are all about “free software and free society.” We write, talk, help, and discuss these topics. You can write articles, participate in the podcast, discuss with like-minded people on our social media channels, or help other users.

We are one of the largest communities for “free software and free society” in the German-speaking world. Every month, we reach 200,000 readers and more than 20,000 listeners. We are 100% donation-funded, 100% tracker-free, and completely transparent.

We want to bring the community together to create added value for everyone.

Translated with DeepL.com (free version)

Icinga is an open source monitoring and observability platform for DevOps and SRE teams. It provides deep insights into complex infrastructures: from traditional systems to cloud and Kubernetes environments. As a community-driven project, Icinga stands for openness, flexibility, and continuous development by users and contributors worldwide.

The project is backed by Icinga GmbH, with a core team of around 20 developers maintaining the project and its many related repositories. Working closely with the community, the team ensures the project's quality, stability, and long-term sustainability.

Illumos was founded in 2010 by former Solaris developers in order to continue developing OpenSolaris as an open project. Today, a growing international developer community and a number of companies collaborate on advancing the base system and its key technologies such as ZFS, DTrace, Zones, and network virtualization. In addition to free distributions like OpenIndiana, SmartOS, and OmniOS CE, illumos is also used as the basis for commercial products in areas such as storage, virtualization, and cloud computing.

LibreOffice is a free, powerful, open-source office suite based on OpenOffice.org. It is developed by the LibreOffice community under the umbrella of the non-profit organization The Document Foundation (TDF). Most community members are volunteers.

An open-source voxel game creation platform. Play one of our many games solo or together. Mod a game as you see fit, or make your own.

Matrix is an open standard and network for secure, decentralised communication. Many clubs and projects, the open source world, and even governments use Matrix for secure, privacy friendly, and digitally sovereign instant messaging.

The first open-source platform for automated database provisioning and management. It supports multiple database technologies and can be hosted on any Kubernetes infrastructure, in the cloud or on-premises. Apache 2.0 licensed, CNCF Sandbox project.

The open Home Automation Bus (openHAB, pronounced ˈəʊpənˈhæb) is an open source, technology agnostic home automation platform which runs as the center of your smart home!
Some of openHAB's strengths are:

Its ability to integrate a multitude of other devices and systems. openHAB includes other home automation systems, (smart) devices and other technologies into a single solution
To provide a uniform user interface and a common approach to automation rules across the entire system, regardless of the number of manufacturers and sub-systems involved
Giving you the most flexible tool available to make almost any home automation wish come true; if you can think it, odds are that you can implement it with openHAB.

The community behind the openSUSE distribution. With openSUSE Tumbleweed, openSUSE Leap and MicroOS, various flavours of the distribution are available to suit a wide range of applications. As a rolling release, Tumbleweed is always up to date. Leap offers a stable foundation with long development cycles. MicroOS represents a different approach with a container-based variant. What they all have in common are the tried-and-tested tools of openSUSE, an extensive software repository and a large community of users and developers. Depending on their own skills, interested parties can contribute to many different areas of the project.

Overte is an open source virtual worlds and social-VR software which enables you to create and share virtual worlds as virtual reality (VR) and desktop experiences. You can create and host your own virtual world, explore other worlds, meet and connect with other users, attend or host live VR events, and much more.

The Overte software provides the following key features:

- Collaborative world creation and editing
- VR support, including body tracking
- Scalability for up to 500 users in a single world
- Scripting in JavaScript, which allows creation of games, interactables, UI elements, and custom applications
- High quality low latency spatial audio
- Powerful physics through Bullet physics engine
- Fully open-source under the permissive Apache 2.0 license
- No central authority. You can run your own server from home.
- No user account required
- Supported by a democratic non-profit organization

Digital sovereignty requires control over your own devices. Phosh provides a free graphical user environment for Linux smartphones running (almost) mainline Linux.

Unlike Android and iOS, Phosh is built on open standards, modular components (Wayland compositor, on-screen keyboard), and community-driven development.

To make these devices suitable for everyday use, we contribute to existing projects such as ModemManager, PipeWire/WirePlumber, wlroots, GNOME, and the Linux kernel. Where necessary, we also develop new components and protocols, such as Cellbroadcastd and Feedbackd.

The Phosh.mobi e.V. provides legal and financial support for the project.

At our booth you can experience:

* Linux smartphones (OnePlus 6, Fairphone, SHIFTphone, Librem 5, …) running Phosh (Mobian/postmarketOS), available for hands-on testing
* Applications for telephony, SMS, web browsing, email, the Fediverse, navigation, authentication, photography, image editing, wallets, public transport, RSS, and Nextcloud
* Topics including installation, hardware, software, roadmap, and how to get involved

For everyone looking for sovereign mobile alternatives: try the devices and ask your questions!

PokyPow is a PCB, that allows you remote power control for your desktop PC with Home Assistant. Power on/off and check if the PC is actually running or not.
Additionally, it has a software lock to prevent children or cats from pressing the button.

Furthermore, I will have a full Home Assistant demo set up with a PokyPow demo, but also a tablet, a recipe printer and some buttons and sensors.

We bring mainline Linux to mobile devices and more!

At our booth will be many smartphones, tablets and Chromebooks running a complete Linux stack with UIs adapted for smaller form factors like GNOME, KDE or Phosh.

Developers from postmarketOS will be there, as well as developers from Phosh and Mobian. We will also have a "FOSS On Mobile" devroom again, where various talks on the topic will be held.

Feel free to join by and try out the devices or check if you have devices that are supported, and feel free to ask us any questions you have!

Privoxy is a non-caching web proxy with advanced filtering capabilities for enhancing privacy, modifying web page data and HTTP headers, controlling access, and removing ads and other obnoxious Internet junk. Privoxy has a flexible configuration and can be customized to suit individual needs and tastes. It has application for both stand-alone systems and multi-user networks.

Privoxy is Free Software and licensed under the GNU GPLv2 or later.

Privoxy is an associated project of Software in the Public Interest (SPI).

Qubes OS is a free and open-source, security-oriented operating XEN-based system for single-user desktop computing.

At our booth we're presenting the release 4.3 not only on a 14-year-old x230 using Heads as a Bios-replacement, we answer questions regarding Qubes OS and show some solutions or workarounds, if there is a more complex configuration needed.

Sonoj is a community of music makers. We're living the open source philosophy not only though the choice of software we're making music with, but also through continuously sharing knowledge. Local gatherings at C4 Cologne are organised every 3rd Wednesday of the month, and the international Sonoj Convention every October. We're excited to meet you there!

Termpaint is a low level terminal interface library for character-cell terminals in the tradition of VT1xx (like xterm, etc).

It’s designed to be portable and flexible to integrate. It covers event handling and rendering.

The PHP Foundation is a collective of people and organizations relying on the PHP language. Its mission is to ensure the long-term prosperity of the PHP language.

The PHP Foundation focuses on providing financial support and guidance to PHP language developers to support its goals of improving the language for its users, providing high-quality maintenance, and improving the PHP language project to retain current contributors and to integrate new contributors.

The PHP Foundation aims to promote the public image of the PHP language in the interest of retaining existing and gaining new users and contributors.

Thymian is an open-source project focused on HTTP API (quality) standards. As software is being developed at an ever-increasing pace, there is a need for tools that ensure compliance with (quality) standards throughout the entire API development lifecycle. While there are tools that offer this for certain aspects, they do not provide consistent coverage across the entire development lifecycle. Thymian, on the other hand, allows you to define universal rules that can be used equally for static linting of API descriptions, testing APIs, and analyzing recorded HTTP traffic, thereby covering the entire development process, from the initial design through the CI pipeline to production deployment. Thymian starts at the very bottom, at the application layer itself: the HTTP protocol. Thymian provides nearly 400 rules that can be used to automatically test compliance with the HTTP specification (RFC 9110). Thanks to a highly flexible, event-driven architecture, Thymian can serve as the core of your own toolchain. Through the central event bus, existing tools and new features can be integrated modularly and combined into a seamless workflow.

Tui Widgets is high-level widget based toolkit for terminal applications.

Tui Widgets is designed to be flexible and similar to use to Qt graphical widgets. Its look and feel is similar to graphical applications or classic full screen terminal applications from the PC world of the 90s.

T2 SDE (System Development Environment) is a highly customizable and portable build system for creating complete Linux distributions from source. It serves as a robust toolkit for building everything from embedded platforms to full desktop systems, offering unmatched flexibility and control.

Members of the community present Ubuntu and Ubuntu Touch to visitors who are interested in Linux-based alternatives to the common operating systems on PCs and smartphones.

Ubuntu is one of the most popular free desktop operating systems. Being easy to use, it is especially aimed at Linux beginners. The project has been developed since 2004 by Canonical and a worldwide open-source community.

Ubuntu Touch is a Linux-based operating system for smartphones, launched by Canonical in 2014. The UBports community took over the project in 2017 when Canonical discontinued it due to limited success, and has been actively maintaining it ever since.

At our booth, we are happy to explain how free operating systems can help better protect your privacy and answer questions, e.g. about supported devices, the installation procedure, or everyday usability. The systems can be tried out on devices that are available at the booth.

Extensible Messaging and Presence Protocol (XMPP) s an open communication protocol designed for instant messaging (IM), presence information, and contact list maintenance. Based on XML (Extensible Markup Language), it enables the near-real-time exchange of structured data between two or more network entities. Designed to be extensible, the protocol offers a multitude of applications beyond traditional IM in the broader realm of message-oriented middleware, including signalling for VoIP, video, file transfer, gaming and other uses. It is also known as Jabber (not the Cisco product).