Additional
Information: Search engines which are specifically targeted at finding open source code or information.
General search engines which are licensed as open source do NOT go in this category!
Search Engines Sites:
Search Tools Listing: Open Source Search Engines Search Tools Listing: Open Source Search Engines: A listing of open source indexers, including links to related articles. (Search Engines) http://www.searchtools.com/tools/tools-opensource.html
Nutch Nutch: Effort to implement a prototype of an open source web-search engine. (Search Engines) http://www.nutch.org
DataparkSearch Engine Tool DataparkSearch Engine Tool: Open source search engine tool released under GPL and designed to organize search within a website, group of websites, intranet or local system. (Search Engines) http://www.dataparksearch.org/
GeekBot GeekBot: Searches over 11,000,000 open source related webpages. (Search Engines) http://geekbot.org/
KDE GUISearch KDE GUISearch: Allows searching the KDE project CVS repository using GUISearch, a new kind of tool for finding code by looking at the applications' GUI text messages (e.g., "Undo") and returning associated callbacks/slots (e.g., slotUndo()). (Search Engines) http://guisearch.sourceforge.net
Additional
Information: Search engines which are specifically targeted at finding open source code or information.
General search engines which are licensed as open source do NOT go in this category! 
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