The phpBB team recently completed a move from SVN to Git and are now hosting their repositories on GitHub!
I remember phpBB being one of my first experiences with online programming — trying to setup a forum for my now dead drumming site.
What’s even better is how much the phpBB team is embracing Git(Hub). Just take a look at the network graph for phpbb3
Welcome, phpBB! You can read more about their move on the phpBB announcement.