Lucene

MySQL has also a Full-Text Search Engine built in. But this Search Engine is not as fast a you probably want to. Thus there are some alternative Full-Text Search Engines which might be working together with MySQL.

• MySQL/MyISAM Full-Text Search
• Sphinx Search
• Lucene
• MnogoSearch
• Solr (based on Lucene)
• Omikron Fact-Finder
• Ioda
• Kneobase (based on Lucene)
• Egothor
• Xapian

More information

• Wikimedia: Fulltext search engines
• Searching for Text Information in Databases

Who uses what Full-Text Search Engine …