[Revisor]

Assembla is not really a GIT hosting, it's project management with repos. You can use tickets, wiki, internal forum, GIT/Mercurial/SVN repos and some build/deploy tools.

Admittedly some of their tools have small problems, but the team is responsive and improves it steadily.

I've used one of their paid programs for everything we do (must be about two years by now) and I would recommend it.

Assembla doesn't seem to have that social aspect like Github, but I find their combination of tickets, wiki, forum and repos more useful.