39C3 Schedule — Open Source Calendar App

Conference program app for the Chaos Communication Congress The 39th Chaos Communication Congress (39C3) takes place in Hamburg on 27–30 Dec 2025, and is the 2025 edition of the annual four-day conference on technology, society and utopia organized by the Chaos Computer Club (CCC) and volunteers. Congress offers lectures and workshops and various sessions on a multitude of topics including (but not limited to) information technology and generally a critical-creative attitude towards technology and the discussion about the effects of technological advances on society. Starting in 1984, Congress has been organized by the community and appreciates all kinds of participation. You are encouraged to contribute by volunteering, setting up and hosting hands-on and self-organized sessions with the other components of your assembly or presenting your own projects to fellow hackers. https://events.ccc.de/congress/2025/ Features * View program by day and rooms (side by side) * Custom grid layout for smartphones (try landscape mode 🙃) and tablets * Read detailed descriptions (speaker names, start time, room name, links, ...) of sessions * Search and filter through all sessions * Add sessions to favorites list * Export favorites list * Setup alarms for individual sessions * Add sessions to your personal calendar * Share a website link to an session with others * Keep track of program changes * Automatic program updates (configurable in settings) * Vote and leave comments on talks and workshops * Integration with the c3nav indoor navigation project https://c3nav.de * Integration with the Engelsystem project https://engel.events.ccc.de - Online tool for coordinating helpers and shifts on large events * Integration with the Chaosflix https://github.com/NiciDieNase/chaosflix - Android app for http://media.ccc.de, share Fahrplan favorites with Chaosflix to import them as bookmarks 🔤 Supported languages (Session descriptions excluded) * Danish * Dutch * English * Finnish * French * German * German (Austria) * Italian * Japanese * Lithuanian * Polish * Portuguese (Brazil) * Portuguese (Portugal) * Russian * Spanish * Swedish * Turkish 💡 Questions regarding the content can only be answered by the content team of the Congress. This app simply offers a way to consume and personalize the conference schedule. 💣 Bug reports are very welcome. It would be awesome if you can describe how to reproduce the particular error. The issue tracker can be found here: https://github.com/EventFahrplan/EventFahrplan/issues 🎨 39C3 Power Cycles. Design by Nina Bender and Bernd Volmer