rmlint is a commandline tool to clean your filesystem from various sort of lint (unused files, twins, etc.).
It runs on Unixoid systems only and beats existing tools in terms of speed features easily.
(About 20x times faster than fdupes in worstcase)

Main Features:
- Very fast (written in C, in many cases faster than rdfind, and always magnitudes faster than fdupes).
- Output of both a ready to use script to handle finds and a easy-to-parse logfile.
- No extra dependencies at all (glibc only though)
- Regex filter for both files and directories.
- Finds duplictes, nonstripped binaries, files with same basenames (nameclusters), empty files/directories, old tempdata, strange filenames and bad links.
- Colorful! :-)