Win Toolkit - BUGS: Do not post bugs in the comments.
Ultimate Windows Tweaker - Ultimate Windows Tweaker is a freeware Tweak UI Utility for tweaking and optimizing Windows.
Winaero Tweaker - Universal tweaker software which supports Windows 7, Windows 8, and Windows 8.1.
NTLite - The Ultimate Windows Customization Tool
Unity Tweak Tool - Unity Tweak Tool is a settings manager for the ...
GIGATweaker - GIGATweaker is a powerfull and compact application that allows you to optimize and tweak your OS.