Gogs
A self-hosted Git service written in Go. Gogs(Go Git Service) is a painless self-hosted Git Service written in Go. The goal of this project is to make the easiest, fastest and most painless way to set up a self-hosted Git service. With Go, this can be done in independent binary distribution across ALL platforms that Go supports, including Linux, Mac OS X, and Windows.
linux open-source git go scm
Herd
A bittorrent based file distribution system based on Twitter’s Murder. It uses BitTorrent to push artifacts and code very fast across thousands of servers.
linux windows osx open-source packaging python
Review Board
Review Board is a feature packed code review tool for multiple SCM systems (like git, bzr, cvs, subversion, etc).
linux open-source commercial scm python