Native

A game whose widescreen method is "Native" is a game where enabling widescreen can be done entirely from the in-game options menus. A game can only be considered "Native" if there is no way to improve the widescreen support externally. For example, if a game supports widescreen resolutions natively, but is vert- this way, and it is possible to make it hor+ via editing the .ini file, it cannot be considered Native.

Killing Floor 2

Killing Floor 2 is a first-person shooter video game developed by Tripwire Interactive. It is a sequel to the 2009 video game Killing Floor.6-player co-op Zed-slaughtering mayhem.

Paragon

Paragon is a MOBA, or Multiplayer Online Battle Arena from Epic Games, in which two teams of five players are pitted against each other in a contest of strategy and action. The players on each team start at opposite ends of the world and must fight their way to the other side to destroy their opponents’ Core.

Yrminsul

YRMINSUL is a strategy game in a persistent universe where each combat is held in the form of a Tower Defence. Crush the forces of good!

Crowman & Wolfboy

Crowman & Wolfboy is an action-adventure 2D platformer which follows two unlikely creatures who feel they are destined for a life beyond the banality of The Dark World. Their only hope rests on a fateful scrap of paper depicting a greater civilization of “humans.”

America's Army: Proving Grounds

America’s Army: Proving Grounds (AA:PG) is a first-person shooter computer/video game created using Unreal Engine 3, and is the most current game of the America’s Army FPS series. AA:PG was released in open beta on August 29, 2013. The game brings back many features from previous AA games and stresses small unit tactical maneuvers and training to reflect the current day U.S. Army.

Mushroom 11

Mushroom 11 is a side-scrolling puzzle game in which you must guide an amorphous organism across obstacles. The player controls the fungus-like blob by clicking and holding and then pointing in certain directions to guide the liquid-like substance in a certain direction. Rather than moving the organism, the player actually removes parts of the organism that then regrow as new cells at the other end of the organism in the specified direction.

X-Men Origins: Wolverine

X-Men Origins: Wolverine is a 2009 action-adventure game loosely based on the film of the same name.

Wrack

Wrack is a cel shaded first-person shooter with gameplay much like the original DOOM.

Tiny and Big Grandpa's Leftovers

Tiny and Big: Grandpa's Leftovers is a puzzle action game that stars Tiny, an inventor who had his Grandpa's underpants stolen by Big. The underwear provide tremendous powers and Tiny has to chase Big down through six levels to reclaim them. The game is built around destructible environments that can be reshaped by cutting them with a laser.

The Old City: Leviathan

From Steam:

The Old City: Leviathan is an experiment in first person exploration that focuses entirely on story. All that exists is you and the world. Set in a decaying city from a civilization long past, The Old City: Leviathan puts the player in the shoes of a sewer dwelling isolationist.