Ask HN: Open Source projects for a C and C++ begginer.

Hello. I have experience using C and C++, I have done some basic things like a simple Socket Chat application in C or a Space Invaders in C++ using SFML2... but I'd like to read some well documented/written code, understand how it works and try to submit a patch.

I downloaded the Mozilla-Central code because the Documentation is excellent: however it's a really huge project, and not only involves Firefox but most of Mozilla's code base like Thunderbird and Boot2Gecko, and that confuses things even more.

Which one do you suggest ?