GOG.com - DRM-free game store, selling both new and old titles. No clients required.
Winaero Tweaker - Universal tweaker software which supports Windows 7, Windows 8, and Windows 8.1.
Origin - Origin is your new digital playground. It’s where you go to find the best that EA has to offer.
Ultimate Windows Tweaker - Ultimate Windows Tweaker is a freeware Tweak UI Utility for tweaking and optimizing Windows.
Epic Games - Computer game storefront that gives 88% of revenue to developers
GIGATweaker - GIGATweaker is a powerfull and compact application that allows you to optimize and tweak your OS.