Kallithea, a member project of Software Freedom Conservancy, is a
GPLv3'd, Free Software source code management system that supports two
leading version control systems, Mercurial and Git, and has a web
interface that is easy to use for users and admins.

You can install Kallithea on your own server and host repositories for
the version control system of your choice.

kallithea-frontend is required for offline installation.
Else nodejs is required, to install frontend requirements, online.