As I have a strong experience in software design and appreciate the values of Free Software, I’m trying to be active in such communities or start my own projects. In particular I work, or worked on the following:
There has been likely way more over the years, but the few above are the most notable ones which come to my mind. For more you can likely look at my framagit profile, my github profile or explore the history of KDE’s git repositories using ComDaAn. ;-)