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Apache Lucene - http://lucene.apache.org/
Search engine library with many features including fast indexing, ranked searching, boolean, phrase, and span queries, date-range searching, and extension APIs. [Open Source] |
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http://www.egothor.org/ - http://www.egothor.org/
A full-featured text search engine. Including starting guide, mailing list signup, and API documentation. [Open source, BSD-like] |
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Java Search Engine - http://www.me.lv/jse/
Full featured text search engine for web sites, completely in Java. Can be easy integrated into any web site. Supports XML, XSLT, EJB. [Freeware] |
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SearchBlox - http://www.searchblox.com/
A search application designed on a robust Java architecture. Results are delivered in a fast and relevant manner. SearchBlox is deployable on any Servlet 2.3/JSP 1.2 compliant server. [Commercial] |
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OSSearch - http://javaboutique.internet.com/servlets/OSSearch/
Servlet acting as a search engine for small websites. [Open Source] |