actually unless something recently changed, GitHub does, it's the enterprise edition and last time i checked it was like $10k a year. Yes, not reasonable for most people but it _is_ an option for people that want the control that comes with self hosting. Its feature set is also always lagging behind normal GitHub. The place i work used to use it (don't ask why). I think it's per-seat licenses but i remember it working out to ~$10k for us and we've got < 40 devs.