Best steam free games?

[Mister_007]

Tittle say's it all!Tell me what you think is the best free game on steam!

 

[Palewing]

Warframe. It's better than a lot of regular titles. Just ignore the cash-shop, as you can get everything by just playing, and you can trade the premium currency.

 

[mcconkeymike]

Dota 2 is my favorite and you don't need as powerful a setup as I have to be able to play it. Team Fortress 2 isn't bad either.