Foamed's Free (non-Steam) Games

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Reddit user 'foamed' posted a categorized list of 166 free-you-can-download-them-right-now games, and I thought "Hey, I know people that like free games..."

Platformers and metroidvanias:

La Mulana
Cave Story
Iji
Spelunky is a roguelike inspired platformer made by Derek Yu. The Xbox remake heavily expands upon the original game in every single way. The PC version has also a lot of different mods which you can download. If you're going to download the original PC version, then I highly recommend you download the unofficial 1.3 version of the game. It fixes a lot of bugs and it also runs much smoother.
Eternal Daughter is a metroidvania released by Derek Yu.
Treasure Adventure Game. You can even add the game to your GOG-catalogue.
Hero is the first game in the "Hero" series. It's only in black and white and it's inspired by old games from the Commodore 64 and Atari era.
Hero Core is a minimalistic metroidvania. This is the second game in the "Hero" series and it's a full fledged metroidvania (compared to the first game). It's available on both PC and Mac.
Hydra Castle Labyrinth is a Japanese metroidvania developed by E. Hashimoto (aka. Buster). Here are some mirrors if the original link doesn't work: http://jayisgames.com/archives/2012/01/hydra_castle_labyrinth.php or http://vsrecommendedgames.wikia.com/wiki/Hydra_Castle_Labyrinth.
Lyle in Cube Sector
An Untitled Story
Within a Deep Forrest
Knytt
Knytt Stories
Poacher is a game created by Yahtzee Croshaw. Yes, that Yahtzee.
Frogatto & Friends
L'Abbaye des Morts ZX-Spectrum graphics with Manic Miner/Jet Set Willy gameplay.
You Have to Win This Game - Retro exploration platformer.
I Wanna be the Guy
I Wanna be the Guy Gaiden: Act 1
suteF
Arvoesine - Short and hard platfomer which closely resembles Ghosts'n Goblins.
Phenomenon 32 - A really hard exploration based platformer.
Celestial Mechanica - Puzzler/Platformer.

Action:

Black Mesa - Remake of the first Half Life game.
Warsow - Fast paced multiplayer FPS.
Quake Live
OpenArena - Quake III Arena clone.
CSPromod - Free improved version of CS 1.6.
Mech Warrior 4
Grand Theft Auto 1
Grand Theft Auto 2
Soldat - 2D Counter Strike with jetpacks.
Marathon Trilogy - Made by Bungie. It's considered to be the spiritual predecessor of Halo.
Alien Swarm - Top down multiplayer shooter made by Valve.
F.E.A.R. Combat - Online multiplayer FPS.
Hidden & Dangerous
Wild Metal
Xonotic - Fast paced multiplayer FPS.
Red Eclipse - Fast paced multiplayer FPS.
Wolfenstein: Enemy Territory
America's Army
Noitu Love - Action filled adventure game made by Konjak.
Assault Cube - Fast paced multiplayer FPS.

Arcade:

N
Super Crate Box is a fast paced arcade game.
Probability 0 - Platformer with roguelike elements.
Tyrian 2000 - Classic Shoot 'em Up. There's also an open source project of the game here: http://code.google.com/p/opentyrian/
Stealth Bastard - Stealth based platformer.
Hyper Princess Pitch - Smash TV clone.
Hydorah - R-Type/Gradius clone.
Virax
Verminest - Arcade shoot em up.
Hurrican - Remake of the old Amiga classic.
Super Smash Land - Super Smash Brothers demake.
Shoot First - The Binding of Isaac meets Smash TV.
Open Liero X - Real time Worms clone.
Frozen Bubble
Little Fighter 2 - Great beat 'em up with single player/co-op/battle mode.