Apache Lucene open-source search software
A Distributed RESTful Search Engine
Innovative text document search. http://dynaq.opendfki.de for details.
An open source search engine with RESTFul API and crawlers
Lucene/Solr based search engine and workflow system
Personalized Search Engine for Your Files
A fast cross-platform TorrentSearch client
The MARKet for Open Source
Data migration/conversion library based on STX and XSLT transformation
zfind is a fast file search utility/API for searching within archives