Code search plugins for Eclipse

http://www.koders.com/downloads/IDEplugins/Eclipse/site.xml searches http://koders.com

http://merobase.com/updates searches http://merobase.com/ (login required)

Roll your own:

http://browsebyquery.sourceforge.net/eclipse-site/site.xml from http://browsebyquery.sourceforge.net/

http://www.opensolaris.org/os/project/opengrok/

Without Eclipse plugin:

http://www.codase.com/
http://www.codefetch.com/
http://www.google.com/codesearch
http://www.google.com/codesearch/advanced_code_search
http://jsourcery.com/
http://www.krugle.org/
http://www.quickref.org/
http://labs.oreilly.com/code/ code from O'Reilly books
http://www.planet-source-code.com/
http://www.codeproject.com/ .Net only
http://www.ucodit.com/espviewer/

JavaDocs:

http://www.jdocs.com/


Code review

http://code.google.com/p/jupiter-eclipse-plugin/