FM SiteSearch Pro
FM SiteSearch Pro is a quick and simple solution to adding professional search capability to a web site. Comes with a relevance engine, control panel, large web site support, mysql support (optional), search/keyword statistics, advanced searches, specialized searches, fully customizable and many more. Also comes with setup interface. See our online demo.

version: 3.4   os: Unix/Linux or Windows based web host   price:
http://www.focalmedia.net/fmsitesearchpro.html   [details]