“Desktop search engines are all the rage these days. While
Beagle may be the most popular desktop search engine for Linux,
there are alternatives. If you are looking for a lightweight and
easy-to-use yet powerful desktop search engine, you might want to
try Recoll. Unlike Beagle, Recoll doesn’t require Mono, it’s fast,
and it’s highly configurable. Recoll is based on Xapian, a mature
open source search engine library that supports advanced features
such as phrase and proximity search, relevance feedback, document
categorization, boolean queries, and wildcard search.“Recoll can handle plain text, HTML, OpenOffice.org documents,
Mozilla Thunderbird and Evolution email messages, and Lyx and
Scribus files…”