Works great - very useful
RegCool - RegCool is an advanced registry editor.
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
Registrar Registry Manager - Advanced Registry Manager for Windows
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Regedit - The Microsoft Registry Editor (regedit.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode