CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
VisiPics - VisiPics does more than just look for identical files, it goes beyond checksums to look for similar...
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Pixiple - Find images similar in pixel and/or metadata content