GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Gitea - A painless self-hosted Git service
Frog Git - Frog Git is the community-based lightweight code hosting solution that is written in the Go language.
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.
GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.
Kiln - Kiln is a complete source control management system based on Git and Mercurial.