We released this last October as a way of broadcasting the work we've been doing in the ecosystem thus far: https://github.com/integrations. There's lots more to be done in that area, and we're learning a ton from our integration partners along the way. Enterprise readiness is one of the big areas we want to keep refining too.
I hope supported injection points is something that will be supported in the future. The way of integrating on top of GitHub with a browser extension, is really a hassle and it's the reason why I'm going to discontinue my Chrome extension.
I would like to bring advanced Git analytics and search to GitHub, but it's not worth the effort considering how easily I can drop it into Bitbucket and VSS.
