Could you elaborate on "integration with almost every open source project" ? I don't get it. For me github (and git) is like iPhone, a place for the "cool kids

Could you elaborate on "integration with almost every open source project" ? I don't get it. For me github (and git) is like iPhone, a place for the "cool kids", and bitbucket for the rest of us :) Mostly because some github/git/iPhone/Mac enthusiasts are rather loud and fanboy-like - this destroys git experience for me. I prefer calm mercurial/linux enviroment :)