Gitorious

Gitorious provides open source infrastructure for hosting open source projects that use Git. The central entity in Gitorious is the project, which contains one or more top-level repositories and any repositories managed by the project’s contributors.

This allows you, as a project administrator, to keep an eye on what people are working on in their individual clones of your repositories. It also lets you merge or provide feedback on their contributions.

Homepage: http://gitorious.org/