Although limited, there is an increasing number of F2P (Free to Play) games available on Steam for Linux. Below is an overview of 16 such titles, all available for free download via Steam.

DotA 2 Homepage

On Steam DotA 2 is based upon the popular WarCraft III mode DotA (Defense of the Ancients), and it is a strategy multiplayer online battle arena game where you control a hero which can advance through various levels and gain new skills and abilities, buy upgrades, items and have to defeat the enemy heroes and structures. (Image credit)

Team Fortress 2 Homepage

On Steam This is a popular, free cartoonish shooter in which you can pick from a range of different classes and weapons and go around destroying your enemies.

No More Room in Hell Homepage

On Steam No More Room in Hell is a horror-themed shooter where you play in an online cooperative mode to defeat hordes of enemy zombies.

Cannons Lasers Rockets On Steam Cannons Lasers Rockets takes place in 3D space environments, and you control a ship which can move in a horizontal plane, you have three weapons at your disposal and have to defeat the enemy ships and base.

Champions of Regnum Homepage

On Steam Champions of Regnum is a MMORPG (Massive Multiplayer Online Playing Game) in the same style of World of Warcraft. You can choose from various characters and go around completing quests and fighting enemies in three different, larg-scaled realms. (Image credit)

Double Action Homepage

On Steam Double Action is a free stylish multiplayer game about diving, flipping, and sliding into action movie mayhem. The game was released on October 23, 2014 and features a fun, dynamic multi-player gamestyle. (Image credit)

Dwarfs!? Homepage

On Steam Dwarfs is a 2D strategy, arcade-like game with various modes and expansion packs. In Dwarfs you have to built up your kingdom, mine for gold, protect your kingdom and survive in the meantime. (Image credit)

Star Conflict Homepage

On Steam Star Conflict is a 3D, graphics intensive massive multiplayer space simulation with beautiful scenery, battles and exploration elements. (Image credit)

Reversion: Chapter 1 - The Escape On Steam Reversion is a Sci-Fi point-and-click adventure game set in 2035, where the main character has to gather clues on what happened to his memory.

WAKFU On Steam WAKFU is a massive multiplayer online role playing game with an anime theme, which features tactical battles in a fantasy universe. (Image credit)

Rising Angels: Reborn On Steam Rising Angels: Reborn is another anime-themed game which takes place in deep space, featuring single-player missions. (Image credit)

Robocraft On Steam Robocraft is a massive multiplayer robot vehicle shooter. It's still in development, but you can play it in early access. According to the description, "if Minecraft smashed straight into World of Tanks you'd get Robocraft". Looking very promising, Robocraft allows you to build your robot, equip it with jets, guns, wheels, and proceed on destroying your enemies.

Gear Up Homepage

On Steam

Released: Jan 28, 2015 Gear Up is a multi-player arcade action game in which you control a robot tank that you can build up using a huge number of gear combinations, and have to defeat your opponents in arenas and modes such as DM, TDM or Conquest.

War Thunder Homepage

On Steam

Released: Aug 15, 2013 War Thunder is a MMO set in the WWII period, in which you can control aircraft, military vehicles and fleets. The game has modern graphics, hundreds of models and includes historical battles.

Fistful of Frags On Steam

Released: May 9, 2014

Steam Reviews: 94% positive Fistful of Frags is a multi-player first-person shooter which takes place in the Wild West.