Namazu is a full-text search system intended for easy use. Not only it works
as a CGI program for a small or medium scale Web search engine, but also works
as a personal use search system for your pile of email. 

(The Japanese word `Namazu' means `catfish' in English) 

WWW: http://www.namazu.org/

*WARNING*: Index file format has changed since namazu 1.3.0.11.
You should care for upgrading from old version.