Remember Saints Row 2? The series really got its stride in Saints Row the Third but the second game shouldn't be looked over, and thanks to GOG, it doesn't have to be.
Right now, Saints Row 2 is absolutely free on GOG. Any PC that can run Saints Row 2 can do so for free. Like everything else on GOG, it's also DRM-free.
Here's the description from the GOG store:
"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.
Set years after the original, the player finds himself in a Stilwater both familiar and strange and challenged with bringing the Saints back as the rightful kings of Stilwater and bringing vengeance to those who wronged him."
Saints Row 2 features tons of customization and even multiplayer in the form of a full co-op story campaign and even competitive multiplayer. It's unknown how long this deal will last, so hurry up and get it into your library before it ends.
Get Saints Row 2 from GOG here.