Hi Guido,
I started http://jecode.org in France last november with two other founders. Our small community is very active, with people committed to coding clubs all over France. While not specifically focus on free software, there is a strong culture of preferring free software when we can, and the founders themselves are free software activists.
So I can only stress again the importance for free software activists to join forces and conduct workshops, participate to the discussions, translate learning materiel, publish free/CC-by(-sa) tutorials, etc.
All the best,