Any good Free To Play games on Steam that's not an FPS or MMO?
I really like Might & Magic: Duel of Champions, it's a collectible card game similar to Hearthstone but far more interesting and complex. Less audiovisual bling but the art is much better IMO, and between daily missions, login rewards, battle rewards and level-ups you open packs at a satisfying rate. You can use the link in my sig to subscribe to get all the starter packs right off the bat, then download the game from Steam:
http://steamcommunity.com/app/256410 What else... there's Warthunder, and incredible plane and tank simulator. By the same company you've got Star Conflict, which is a similar idea with spaceships with a narrower scope.
You also have the little known but well made RTS AirMech, an online multiplayer remake of the classic Herzog Zwei.
Then you have the cute but still engaging Spiral Knights, an 3rd-person almost top-down action game where you go down in trap-filled procedurally generated dungeons in groups of four. Don't be fooled by the looks, it requires quite a bit of skill to tackle the harder challenges.
And that's just off the top of my head.