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LXR The [http://lxr.linux.no/ Linux Cross Reference] is probably the first widely used web-based code cross-reference tool. Along came [http://opengrok.github.io/OpenGrok/ OpenGrok] which started out as a project at Sun (which was bought by Oracle) and now the project lives on its own in the open. OpenGrok is '''lightening fast''' and is actively maintained as an open source project on GitHub. By the way, the underlying search is powered by SOLR. Meanwhile, [http://kohsuke.org/ Kohsuke Kawaguchi] the magic man behind Jenkins (n�e Hudson), also wrote [http://sorcerer.jenkins-ci.org/ Sorceror] which understands semantics in Java. Sadly, Sorceror code hasn't been touched in 4 years and doesn't seem to be an active project - but for Java codebases, it's probably still a good option.