Gitea - A painless self-hosted Git service
django-git - A simple Gitweb replacement built with Django.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Gitolite - Setup git hosting on a central server, with fine-grained access control
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.
repo.or.cz - repo.or.cz is a public Git hosting site.