slackbuilds_ponce/system/catfish

Catfish is a handy file searching tool for linux and unix.
Basically, it is a frontend for different search engines (daemons) which 
provides a unified interface. The interface is intentionally lightweight 
and simple, using only GTK+ 2.  You can configure it to your needs by 
using several command line options.

pyxdg (also available here) is an optional dependency.