Bonobo Git Server - Set up your own self hosted git server on IIS for Windows.
Gitea - A painless self-hosted Git service
Launchpad.net - Launchpad is a software collaboration platform by Canonical
GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.
GitPrep - GitPrep is a Github clone.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab