The Chaostreff Osnabrück e.V. is a group of people interested in topics like security, cryptography, alternative operating systems, free (libre) software, internet related politics and what else comes to mind.

People interested in our topics are welcome at our regular meetings.

Regular meetings

Every second Thursday we meet at 7 pm at the AStA of the University of Osnabrück, Alte Münze 12, 49074 Osnabrück in our hackspace Rabbithole.

Calendar

All events of the next months can be viewed online, be subscribed to as iCalendar or be downloaded as .ics file: to our calendar.

Email

• Contact
• Press requests

Public Chatroom

• Visitors are welcome in the public Jabber MUC.
• The public Matrix room is bidirectionally mirrored with the public Jabber MUC.

Mailing list

For more detailed discussions about different topics we offer our public mailinglist.

Social Media

• Fediverse (Mastodon): @chaostreff_osnabrueck
• X (formerly Twitter): @ctreffos

Projects

• Press release: Opening of osna.social (German)
• chaOStalks
• Chaos Colloquia
• Statement on the statute of the freedom of information (German)
• #noNPOG Bündnis (German)
• Open letter Covid contact tracing apps (German)

GitHub

github.com/CTreffOS