Desktop search application
DocFetcher is an Open Source desktop search application: It allows you to search the contents of files on your computer. — You can think of it as Google for your local files. The application runs on Windows, Linux and Mac OS X.
A mailbox or/and mail dir search soft based on lucene
Open Enterprise Search Platform. The project aims to deliver a complete Open Enterprise Search Platform, by packaging several available freely available components together. The core component is Apache SOLR based on Lucene.
XML abstraction interface for Lucene and reference implementation