The 4th is (http://www.recompile.se/). We aren't very active yet - still trying to find the right hook to get people interested. We aim to provide a professional-style software development environment with somewhat of a free software activism slant.

We do currently cooperate with the Filurum (https://www.facebook.com/filurum) gifted children group to provide a meeting place every week - in fact, it's what I'm doing later today.