Gerrit Code Review - OpenSource Git Code Review Tool
Trac - Trac is a project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.
Phabricator - Phacility - Phabricator
Bandcamp Artists - The Bandcamp app for artists and labels
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.
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.