Open Source Gardens – A movement about the cultivation of Open Source Seeds using Open Source garden technologies. Join us!
// foss.events – A community driven database and calendar of Free and Open Source Software events in Europe. Join us!
Also can you find me & some of my public contributions at:
Free Software Foundation Europe – creating campaigns and projects
Wikimedia Commons – contributing pictures to Wikipedia.org
OpenStreetMap – meta-mapping OSM
Netzpolitik.org – some articles by me
media.ccc.de – some talks by me