WordPress search engine based on Lucene. Sounds pretty solid.
#fulltext
Changing MySQL FULLTEXT word length
Changing MySQL FULLTEXT word length
Details on how to reduce (or increase) the minimum length of a word that MySQL’s FULLTEXT index type will recognize.
symfony custom Criteria object
symfony custom Criteria object
Using a custom Criteria object in symfony.
Search Reloaded
WordPress plugin that just adds fulltext indexing to try to improve the built in search system.
PHP Classes – Class: Guaranix Full Text
PHP Classes – Class: Guaranix Full Text
A PHP powered system for fulltext indexing documents for searching etc