Want your own Github? Check out the open source Gitorious.
gitorious.org
gitorious.org
I don't know what the status of the Trac support is, but it should be easy to add.
Account management is tedious, and it's something I never want to do. With Github, people can fork my projects without me doing anything until they actually commit something. This saves me a lot of time, since people say they want to work on something, but never do. With Github, these people don't take up any of my time. If they do end up contributing it takes about the same amount of time to make them a committer on Github as it does anywhere else.
Anyway, the network effect always wins.
Seriously tho, don't down mod me I have a serious comment - IMHO, Github is way better just because of the graphics. I know, the old mac vs PC vs Linux debate comes to mind, but seriously graphics make me work better. They makes me happier. And Github is just pretty - the spacing of the letters are nice, the look is all light and pretty, etc. It makes me WANT to submit another commit!
But it's still awesome there are alternatives out there. Way to go, coder gents.