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, Bazaar, Git, ClearCase, Perforce, SCCS, RCS, CVS, or Subversion. In other words, it lets you grok (profoundly understand) the source.
A problem with the ignore list not skipping many files was fixed. Caching was added to the Web app. There were various cleanups and script improvements. README files are now shown again if the indexer is out of sync. When upgrading, there is no need to reindex from scratch