[adamnemecek]

I think that some people use GitLab to host their own Github clones. It's debatable whether that's a viable alternative.

[wldlyinaccurate]

I used GitLab with a small team for a while and found it to be adequate. It never quite felt as good as GitHub and was missing a few trivial features (although I can't remember any right now) but overall it was a pretty good experience.