| Associative Indexing Service | | An application for easy adding of keywords for archives and any resources for fast future access. It is an extension of associative memory, associative helper and also may be used as a personal search engine. |
| BDDBot | | A web robot, search engine and web server written in Java and available under GPL. Includes related resources. [Project no longer actively updated] |
| 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. |
| 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. |
| JXTA Search | | A distributed search system, designed for peer to peer networks and web sites. |
| 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()). |
| Nutch | | Effort to implement a prototype of an open source web-search engine. |
| Open Source Search | | Resources, ideas and news site for developing next generation open source search engines. Includes relevant source libraries and white papers. |
| Open, Distributed Web Search | | Article that discusses the concepts of an open source, community-run, distributed web search service. One possible architecture is presented, although no working code or implementation exists. |
| OpenWebSpider | | An open source web spider and search engine. Includes demo, source code and screenshots. |
| Oxyus | | An open source search engine written in Java, aimed to provide a search button for websites. Includes related project news. |
| Sourcebank | | Full-text search engine for source code. |
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