Games
Games Retailing or orther relevant tools
Cheat Engine 
Hack local games by simple scripts
Official client for the DRM-free game store GOG.com
Control your joystick PC games with keyboard
Locale Emulator 
Yet another region and language simulator.
Origin
Like Steam, but belongs to EA.
Remotr 
Stream and play your own computer games on your mobile phone, tablet, or even Smart TV
Steam
Largest online video game retailer. Desktop app allows you to organise your library of games and play them at any time.