We just moved over to Gitlab from just pure gitolite and it is such a great tool. Certain things like opening and assigning issues, wiki pages, merge requests, all on our private servers are amazing. I highly suggest running Gitlab on your servers if you're not comfortable with github or would rather have things on your own servers.
You know, at the cost of $2,500 per year, (although I can't actually find where to purchase the software) you'd probably be better to just YouTube some kid's backtrack tutorial.