Articles about events that may be worthwhile to attend or interesting to learn about for readers, like conferences or workshops.
Articles and tutorials about hardware on Linux, or about little tricks to make things work (again).
Articles and tutorials about the free and open source vector drawing application Inkscape, in German and English.
Paper in all its various forms: cut, folded, glued, printed - origamic architecture, origami, papercraft, art. Templates for downloading and making them yourself.
Articles and tutorials about usage of free and open source software (other than Inkscape, which has got its own category).