NTLite - The Ultimate Windows Customization Tool
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Win Toolkit - BUGS: Do not post bugs in the comments.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
WinReducer - Customize Windows (Integrate cursors, themes, wallpapers or change files to improve Windows...
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode