Let me tell you the story of how I got involved in the Perl 6 community.
I was trying to find out how Perl 6 was progressing, and found a broken link on a related website (pugscode.org, now defunct). So I went into the #perl6 IRC channel to report it.
Within three minutes, Audrey Tang (to become minister without portfolio in Taiwan in October) had committed a fix, somehow found an email address of mine, and sent me a commit bit to the central SVN repo that contained the Pugs project (the Perl 6 implementation in Haskell she was working on), the source to various websites, the Perl 6 test suite, and a lot of other stuff around the ecosystem. Just because I reported a broken link.
It was the most inclusive community I've ever experienced.
They had written a custom web app to manage email-based invites to an SVN repo, where everybody with commit access could invite somebody else.
Today, we try to carry on her inclusiveness, and give just about everybody who wants write access to all repos of the perl6 organization on github. We have a github team with more than 220 members and about 40 repos, including the Perl 6 design documents, the official test suite, the perl6.org website and the official docs. I haven't heard of a single instance of vandalism or other misuse of the trust.
Want to contribute to Perl 6? Just tell me your github username!