KinoSearch is a loose port of the Java search engine library Apache Lucene,
written in Perl and C. The archetypal application is website search, but it
can be put to many different uses.

Features
 * Extremely fast and scalable - can handle millions of documents
 * Full support for 12 Indo-European languages.
 * Support for boolean operators AND, OR, and AND NOT; parenthetical
   groupings, and prepended +plus and -minus
 * Algorithmic selection of relevant excerpts and highlighting of search terms
   within excerpts
 * Highly customizable query and indexing APIs
 * Phrase matching
 * Stemming
 * Stoplists

WWW: http://www.rectangular.com/kinosearch/