Phabricator is an open source collection of web applications which make it easier to write, review, and share source code.

Features:
* Review Code: Review others' code with Differential
* Track Bugs: You can keep track of all the defects,
and problems in your awful software with Maniphest.
* Browse Source: You can browse source code on the web with Diffusion
* Wiki: You can write things down in Phriction
* ... and others