EXPIRED Freebie | Saints Row 2 for free | Steam
Probably the only game that rivals the GTA franchise. Get it free on Steam while it's there. It says limited time but no indication of when it will end.
As per the website:
Saints Row 2 brings true freedom to open-world gaming. Players can play as who they want, how they want, and with whomever they want in this sequel to the much acclaimed and tremendously successful Saints Row.