官方Homepage：
http://hub.opensolaris.org/bin/view/Project+opengrok
官方定义：
OpenGrok一个快速、便于使用的源代码搜索与对照引擎。它帮助你搜索，对照，定位你的源代码树。它能够明白各种程序文件格式和版本控制历史记录如 SCCS,RCS,CVS与Subversion。OpenGrok是OpenSolaris操作系统源文件浏览和搜索的工具。
OpenGrok is a fast and usable source code search and cross reference engine. It helps you search, cross-reference and navigate your source tree. It can understand various program file formats and version control histories like Mercurial, Git, SCCS, RCS, CVS, Subversion, Teamware, ClearCase, Perforce, Monotone and Bazaar.
In other words it lets you grok (profoundly understand) the open source, hence the name OpenGrok. It is written in Java.
OpenGrok is the tool used for the OpenSolaris source browser and search.
官方Logo：
"A wicked fast source browser"
Screenshot:
Install OpenGrok on Windows:
http://lifeisbetter.in/blog/2009/05/11/install-opengrok-on-windows/
现在可能不需要上面这个哥们那么麻烦啦。
Other Materials:
http://www.dazuiniu.com/blog/2010/05/12/install-opengrok-to-read-sources.html
Piaoger有话说:
有这玩意儿打造自己的Knowleadge System很帅很好啊，要是能够和Doxygen产生的结果结合起来就好了