OpenGrok is a source code cross-reference and search engine.

It helps programmers search, cross-reference, and navigate source code trees to aid program comprehension.

It can read program file formats and version control histories such as Monotone, Subversion, Mercurial, Git, ClearCase, Perforce, AccuRev, Razor, and Bazaar.

OpenGrok is being developed mainly by the community with the help of a few engineers from the Oracle Corporation.

OpenGrok is released under the terms of the Common Development and Distribution License (CDDL).