NTLite - The Ultimate Windows Customization Tool
Autoruns - See what programs are configured to startup automatically when your system boots and you login.
Win Toolkit - BUGS: Do not post bugs in the comments.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
WinReducer - Customize Windows (Integrate cursors, themes, wallpapers or change files to improve Windows...
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.