Git-Repo - Manage Gitlab, GitHub and Bitbucket from the command line
NethServer - NethServer is an operating system for Linux enthusiasts, designed for small offices and medium...
Git Flow - Git Flow is a very self-explanatory free software workflow for managing Git branches.
ClearOS - A very good alternative for Windows Server, for free
Gitential - Analytics for Git Repositories
Univention Corporate Server - Univention Corporate Server UCS with Active Directory functions and App Center is the cost-efficient and popular successor to Microsoft's server solutions.