AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Xslimmer - Your Mac on a Diet With Xslimmer - Universal Application Slimmer for Mac OS X 10.3 and up.
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Disk Xray - Disk Xray is a disk usage statistics viewer, duplicate files and folders finder and cleanup tool for Mac OS X. Disk Xray performs three fundamental functions, and it performs them great.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.