If you're a git user and have thought about bringing things a bit more "in-house" than GitHub but still want some of the perks of the web-based interface, this quick tutorial from PHPMaster about installing Gitlist might interest you.

aking your repositories available in a local intranet is pretty easy, but having a nice interface to interact with those repositories, making collaboration between teams easier, is not that simple. [...] There are other solutions available, but some are too hard to install or, again, hard on the eyes. I recently discovered GitList, a free and open source Git repository viewer. It's interface resembles GitHub a lot but aims to keep everything simple and clear.

He includes the basic installation steps you'll need to get it up and running - setting up the environment, downloading and configuring Gitlist to look at your repositories and pointing out that, since the LESS source is included in the download, you can customize it how you see fit.