Local search engines to try

Sphinder: PHP + MySQL backend for storage
http://www.sphider.eu/

Xapian: Perl + any database
http://xapian.org/

Apache Solr: Java/Tomcat for web interface, web layer on Lucene
http://lucene.apache.org/solr/
http://www.ibm.com/developerworks/library/os-php-apachesolr/index.html