Non-Steam Game you used to play.

Osu, Touhou, and Touhou related games. It'd be nice if the games were put on Greenlight, though.

Minecraft, Perfect World International, and Freelancer are my big three.

League of Legends and Minecraft

osu! and League of Legends

Dominions 3 and the Sudden Strike series. With any luck Dominions 3 might make it through greenlight at least.

Alpha centauri

Power Grid

Simcity

MapleStory.

Diablo 3

Battlefield 3

Heroes of Might and Magic 3 . Probably best game ever made.

Heroes of Newerth

Homeworld

Creeper world.
great game, good strategy, still, a bit underrated.
the sequel is also good.
oh, and fantastic contraption 2, hell, that thing is great.

Theme Hospital, both Dungeon Keeper games, Cook Serve Delicious (which admittedly is trying to get on steam but has yet to be green lit) and my console games.

Split/Second.

Blizzard games, Halo: Combat Evolved, League of Legends, osu!

unepic

FIFA13

Ultima Online
Quake III Arena

Red Alert, Age of Empires, Red Alert 2, Red Alert 2: Yuri's Revenge, Age of Empires II, Anno 1602, SimCity 2000, and many more recent ones. I think my favorite is probably still Red Alert 2: Yuri's Revenge, though. :)

Battle Realms

Dragon's Dogma: Dark Arisen