Gitea - A painless self-hosted Git service
GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.
Bonobo Git Server - Set up your own self hosted git server on IIS for Windows.
Launchpad.net - Launchpad is a software collaboration platform by Canonical
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Gitblit - Pure Java Git solution for managing, viewing, and serving Git repositories