Bang Bang

Wolfenstein: Enemy Territory
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Attack and defend in a class-based shooter set in the oft-ignored WWII.

F.E.A.R. Combat
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F.E.A.R.’s multiplayer decoupled from the main game. Full of slow-motion shooting and kung-fu.

Savage
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Online fantasy shooter with a touch of RPG and RTS. Each team has a commander to order its troops.

World of Padman
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Cute online/offline cartoon shooter, with oversized maps (you appear tiny) and multiple game modes.

Cube 2: Sauerbraten
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Single- and multiplayer old-school blaster lets the player edit the map in-game.

Celestial Impact
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Brilliant multiplayer shooter where your guns deform the very moonlets you fight upon.

Paintball 2.0
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Based the open-source Quake 2 engine: deathmatch without death.

Nexuiz
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Old-school shooter with loads of levels, modes, and mutators.

Tremulous
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Choose from different races - aliens or humans - build up bases, and pwn.

America’s Army
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Hardcore shooter sponsored by the U.S. military.

Blood on the Asphalt

Armagetron Advanced
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Tron’s iconic lightcycles rendered as a multiplayer vehicle combat game. Extra modes include CTF.

Gride
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Add and remove abilities from your ever-moving car in order to go as far as you can across infinite terrain.

Type Racer
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A racing game where your speed is dictated by how quickly you can type.

Racing Pitch
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Using a microphone, make engine noises with your mouth in order to make your car accelerate.

Goliath
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Team-based vehicle combat game in a world of road warriors terrorized by an enormous, unstoppable tank.

ElastoMania
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Motorbike sim emblazoned with proper physics has literally tens of thousands of levels available to download.

Trackmania Nations Forever
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The ultra-excellent TrackMania, completely free! And now you can play against people with the pay-for version, too.

Above: If you only download one of these free racers, make sure it’s this one

Off-Road

Velociraptor Safari
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A velociraptor driving a jeep, running over other velociraptors. If you don’t want to play this, we don’t even want know you.

Rider
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Paperboy crossed with Tokyo Bus Guide. Deliver packages without breaking the laws of the road.

GeneRally
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A minimalist Micro Machines. Up to six players can bounce and break their cars together.

Wild Metal
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Early Rockstar game of vehicular combat - you fight automated military units on the Tehric planetary system.

RPFree

Charles Barkley, Shut up and Jam: Gaiden
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Gaiden_Charles-Barkley-Shut-up-and-Die-Gaiden---FREE-GAME/2220
The year is 2053. Basketball is illegal. But that won’t stop you. Deeply weird, and very funny.

Below: Warning: This game is hilarious

Sewer Goblet
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Old-school RPG about what happens when the Wu-Tang Clan adopt a baby.

The Diary of Anne Frank
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An authentic depiction of Anne Frank’s life, in platform form.

Winter’s Heart
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Snow-based combat and a really cute story make for an adorable mini-RPG.

The Desolate Room
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Enormously involved robot combat that’s raising money for a playground in Afghanistan.

Exit Fate 
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Turn-based RPG with tactical strategy combat. And bribery.

Last Scenario
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A deep RPG replete with side-quests and its own spell-card system.

Above: Last Scenario was made with RPGMaker XP and looks great 

Wilfred, The Hero
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Wilfred and Kyr-Stan are trying to remove evil from the world. Go, guys!

Eternal Daughter
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Great character design, original music and an excellent story makes Eternal Daughter one of the best freeware RPGs ever released.

Exult
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A fan-made remake of Ultima 7 that works on modern PCs.

Flyff
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Flyff: Fly for Fun is chock full of fantasy flair and a respectable class system. Level-up lovers and experience whores who balk at monthly fees and level caps will feel right at home on the fields of Flyff.

Forumwarz
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Legendary spoof RPG. Will you play as Camwhore, Emokid, or Troll?

Murloc RPG: Stranglethorn Fever
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You play as Murk, a slimy gurgling guardian of the forest. Level him up into a killing machine as you climb the ladders of the Gurubashi Arena and take down Hakkar in Zul’Gurub. Murloc RPG is the sort of game that only a true WoW fan could create, and one that all WoW fans will enjoy.
 

Above: Grrraaaguurraahaaa! That's the closest we can get to spelling out the guttural call of the Murloc

Press Up to Jump

Platform Racing
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A multiplayer racing game that works like an old-school Mario platformer.

Sunset Runner or The Suspiciously Long Train
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Run along the top of a train, jumping gaps and ducking the obstacles.

Bonesaw
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Beat-em-up, puzzler, and platformer in which you hit folks with a hockey stick.

Above: This evil referee banishes your entire team to an inter-dimensional penalty box at the beginning of the game 

Hurrican
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Jump and shoot game with a protagonist who looks an awful lot like Robocop.

Death Worm!
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Death Worm! Death Worm! Death Worm! Death Worm!

Fantastic Blood Boy
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Use randomly generated items to indirectly attack enemies.

What Linus Bruckman Sees When His Eyes Are Closed
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Amazing split-screen platformer where you play as both an ancient samurai and a fast-food heir.

7 Minutes
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Astonishingly nihilistic, with some lovely inventive moments, especially when it all goes dark.

Cave Story
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Cute, classy side-scrolling platform game. We’ve usefully provided the English translation.

You’ve Got to Burn the Rope
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A commentary on games. The title may contain a clue.

The Power
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So focused on exploration that it boasts it has no puzzles.

Fancy Pants Adventures
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Free-running adventure set in a beautifully animated world.

Above: Fancy Pants Adventure looks great in motion and reminds us of a Don Hertzfeldt cartoon 

Bollen
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If Super Mario starred a ball instead of a plumber, you’d get this. Bounce through increasingly difficult levels to reach the flag.

Muon
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Bounce your double-jumping cube around randomly generated levels.

Paroxysm
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A bit like Prince of Persia - you guide your little man through dungeons of spikes and traps.