Web Directory

» Arachnode.net
   A .NET web crawler written in C# using SQL 2005 and Lucene. Documentation and online demonstration.
   http://arachnode.net/

» BDDBot
   A web robot, search engine and web server written in Java and available under GPL. Includes related resources. [Project no longer actively updated]
   http://www.twmacinta.com/bddbot/

» 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.
   http://www.dataparksearch.org/

» Egothor
   A cross-platform, full-featured text search engine written entirely in Java. It can be configured as a standalone engine, metasearcher, peer-to-peer HUB or used as a class library.
   http://www.egothor.org/

» Grub
   Open source, cross-platform distributed crawler. FAQ, documentation and a support forum.
   http://www.grub.org/

» KDE GUISearch
   A tool for finding code by looking at the applications' GUI text messages (e.g., "Undo") and returning associated callbacks/slots (e.g., slotUndo()). Allows searching the KDE project CVS repository as a live demonstration.
   http://guisearch.sourceforge.net/

» Locust
   Specifically designed for knowledge area or corporate search, written in C++.
   http://sourceforge.net/projects/locust/

» Nutch
   Effort to implement a prototype of an open source web-search engine.
   http://lucene.apache.org/nutch/

» Open Search Server
   Web crawler based on Lucene, Apache Tomcat, Java Server Faces and JBoss RichFaces. News, product information, documentation, download, and discussion forums.
   http://www.open-search-server.com/

» OpenWebSpider
   An open source web spider and search engine. Includes demo, source code and screenshots.
   http://www.openwebspider.org/

» Search Tools Listing: Open Source Search Engines
   A listing of open source indexers, including links to related articles.
   http://www.searchtools.com/tools/tools-opensource.html

» Sphider
   A lightweight search engine in PHP. Includes details of features, documentation, support forum, and download. [GPL]
   http://www.sphider.eu/

» The Xapian Project
   Open source search engine library written in C++, with bindings to allow use from other languages as well.
   http://xapian.org/

» YaCy
   A distributed Web crawler and caching HTTP/HTTPS proxy built on the principles of peer-to-peer (P2P) networks.
   http://www.yacy.net/