Opensource C projects

I did in the past some basic C/C++ programming on my own and hoped to combine my effort with some others. So ...

1) Who has an overview of currently interesting projects (To join)?
2) How to start such kind of Opensource projects by yourself?
3) Somebody wants to share his experience with this (Pro/Contra)?
4) ...
One of the biggest, if not the biggest open source repository is the sourceforge site.

http://sourceforge.net/

That site will probably answer your first two questions. I can't help you with the third.
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