CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
iHex - iHex is the premier hex editor and data analysis tool for Mac OS X.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
HextEdit - HextEdit is a proficient hex editor and disassembler for Mac.