I run a gogs[0] instance, which is a GitHub clone with great performance characteristics. I use it for both company and personal projects, and we haven't had any downtime. No more productivity drop when github is down :D.

I recently discovered another huge dependency I have when coding though : StackOverflow. That's going to be a lot harder to replace though...

[0]: https://github.com/gogits/gogs

PS: Yes, I realize the irony in using a github link here...