Good Gear Guide
In Pictures: Facebook’s most important open source...
A potpourri of web-based apps that make it easier for software developers to communicate about software projects, Phabricator includes apps for bug tracking, source code browsing, review code and more. It’s a great set of utilities that make life a lot easier for teams of developing software, and is actively updated by Facebook and the many other companies that are currently using it.
In Pictures: Facebook’s most important open source projects