Ultimate Windows Tweaker - Ultimate Windows Tweaker is a freeware Tweak UI Utility for tweaking and optimizing Windows.
WinReducer - Customize Windows (Integrate cursors, themes, wallpapers or change files to improve Windows...
Winaero Tweaker - Universal tweaker software which supports Windows 7, Windows 8, and Windows 8.1.
Dism++ - Dism++ is a free portable Windows optimizer and manager.
Win Toolkit - BUGS: Do not post bugs in the comments.
NTLite - The Ultimate Windows Customization Tool