Hosting git repositories -- Gitolite allows you to setup git hosting on a central server, with very fine-grained access control and many (many!) more powerful features.
sitaramc/gitolite is #7,879 on the bestofgithub Elo ladder, in Bronze III, with a rating of 1,400 (+4 this week). It has 8,601 stars, 4 gained in the last week.