Works great - very useful
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
CleanMem - CleanMem keeps memory use in check on the system without the memory being pushed to the page file.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Fossils - Find and clean out all your old unused files
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
DaisyDisk - DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.