First Person

Among the Sleep - First Person Horror Adventure

Aeons - Free Retro inspired First Person Shooter!

Bewilder House - First Person Puzzle Horror

CDF Ghostship - First Person Horror Shooter Chex Quest 3 - ZDoom engine [ FPS ]

Candy Scroll Justice Saga - Free first person RPG from the #candyjam

CATLATERAL DAMAGE - First Person Destructive Cat Simulator (Open Alpha/Steam Greenlight)

Chivalry: Medieval Warfare - Fps/hand to hand combat sim

DayZ - Another Zombie Apocalypse Game ( November Update )

Daylight - First Person Horro 

Dead Effect - Deadly Zombies in space with tons of gore! (Steam Greenlight)

Duke Nukem 2.5 - It's duke but in blocky pixels!
Dungeon Nightmares - Possibly the scariest free game since Slenderman?

Eleusis - 3d First Person Adventure Horror

Doorways - A first person survival horror game

Grave - Explore an ever-changing world filled with frightening creatures (Kickstarter/Steam Greenlight)

Kingdoms Rise - A Multiplayer Fantasy Sword Fighting Game that gives the wow factor

Illuminascii - First Person Shooter with a very unique style

In The Kingdom - Twistedly evil first person shooter!

Into The Dark - Horror First Person Shooter

Lemma : An immersive first-person parkour game (Kickstarter,Steam Greenlight+Demo)

Life after us shipwrecked - First person Horror

Modulate - First person puzzle game that needs your votes via Steam Greenlight

Monokrome - A first person physics based game released for free

MTBFreeride - Intense rush of a mountain bike riding game, and it's FREE!

Natural Selection 2 - Steam ( FPS )

Neon Shadow - First Person Shooter with plenty of Action

Paranormal - A fully dynamic haunting-simulator

Paranautical Activity - Roguelike FPS

Pesadelo - First person horror from Brazil

Rebirth - First person survival horror (Steam Greenlight Success!)

RetroBlazer - FPS

Ravaged- Online FPS

SCALE - First person reality manipulation game

Slender - Indie horror game

Survivor Zero - Sandbox style Survival Horror Game

Tactical Intervention - A free to play FPS from the co-creator of the hit classic Counter-Strike

The Unknown - Free procedurally generated horror game

U55 - END OF THE LINE - A horror of H.P. Lovecraft (Kickstarter)

Wolfenstein 3d - The Final Solution - New free game based on a first person classic!