GitPrep : GitPrep is Github clone. you can install portable github system into unix/linux. You can create users and repositories without limitation.
pump.io : Social server with an ActivityStreams API. It's a stream server that does most of what people really want from a social network.
Riot : Riot allows teams to communicate across a wide range of collaboration apps. If some team members use Riot while others use IRC, Slack or Gitter, Riot ...
Sourcegraph : Sourcegraph Server is a free, self-hosted code search server that integrates with your code host and supports multi-repository, regexp, and diff searc...
Gitea is a community managed fork of Gogs, lightweight code hosting solution written in Go and published under the MIT license.