Steam Co-Op Games in Common

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Left 4 Dead 2

Take the role of a different set of survivors as you use all new blunt force weapons, chainsaws and new guns in the sequel to Left 4 Dead. Teamwork is even more crucial as high intensity moments require greater communication to survive.To enable split screen refer to this post.

Magicka

Four player co-op is available in all game modes and types including a story mode and an unlockable survival mode. While you can't drop in to a game, you can drop out and not break the session if you aren't the host.

Saints Row: The Third

The entire Saints Row: The Third experience can be enjoyed by two players through online play or system link. The game requires an online pass for co-op play.

Dungeon Defenders

Team up as one of four characters each with their own unique abilities and traps to conquer dungeons in this tower defense action/RPG hybrid.

Hammerwatch

Solo or cooperate in this adventure from bottom to top of Castle Hammerwatch. Kill hordes of enemies with varied looks and features through four unique enviroments with traps, hidden secrets and puzzles.

PAYDAY: The Heist

Four player online or LAN play with drop in/drop out support.