Games
- Action
- Armagetron Advanced - Multiplayer game in 3d.
- Azimuth - Metroidvania game, with vector graphics.
- C-Dogs SDL - Classic overhead run-and-gun game.
- Chaos Projectile - 2-D action arcade game withrole-playing elements.
- Chaotic Rage - A silly zombie shooter game.
- Endless Sky - A space exploration and combat game.
- Epic Inventor - Side-scrolling action RPG.
- Gang Garrison 2 - A demake of a 3D game in 8-bit, side-scrolling style.
- Goat Attack - Fast-paced multiplayer pixel art shooter game.
- Grid Runners - Time and resource management and hacking game.
- Hurrican - Highly explosive Run and Gun arcade game.
- Liero - Liero is a simple game. Pick your five weapons, and unleash your inner fury.
- Limit Load - Cockpit flight game featuring modern military jets.
- Lugaru HD - Third-person action game.
- Nox Imperii - Open-ended space exploration game set in randomized galaxies.
- OpenClonk - Multiplayer game mainly about mining, settling and fast-paced melees.
- OpenLieroX - Based on Liero gameplay, OpenLierox is an extremely addictive realtime worms shoot-em-up.
- Petigor's Tale - Fantasy hack & slash action game.
- Tank Arena - Split screen tank multiplayer game made in 1997.
- The Dark Mod - First-person stealth game.
- The Pandoran War - 2D mission-based space shooter.
- The Yearning -
- Witch Blast - Roguelike dungeon crawl shooter.
- Zero Ballistics - Unique blend of first person shooter and tank combat.
- zSILENCER - Multiplayer team based capture-the-flag style game.
- Adventure
- AdaVenture - Kid-friendly retro point & click game.
- Dead Ascend - A classic hand-drawn point'n'click-like adventure.
- Arcade
- AstroMenace - Hardcore 3D space shooter.
- Battle Tanks - A funny battle on your desk.
- Brick Infest - Brick-breaking arcade game.
- heXon - Free and open source twin-stick-shooter.
- Kobo Deluxe - Fast-paced shoot-em-up.
- Mayhem - multiplayer flight shooter.
- Mystic Mine - Arcade puzzler with multiplayer for up to six players.
- Neverball - Part puzzle game, part action game.
- Neverball Clockwork - Custom build of Neverball that includes collectible clocks, an item used to extend time.
- Ostrich Riders - Free clone of the arcade game "Joust".
- Return of Dr. Destructo - Remake of the classic "Island of Dr. Destructo".
- Swervin' Mervin -
- Those Funny Funguloids - Space-flying-mushroom-picking-simulator.
- Trackball - A marble game inspired by Marble Madness.
- Board Games
- Fighting
- FPS
- Aleph One - Continuation of Bungie’s Marathon 2 game engine.
- Alien Arena - A fast, fun and FREE FPS.
- AssaultCube - Realistic environments, with fast, arcade gameplay.
- Beyond Dying Skies - Beyond Dying Skies is a 3D FPS-RPG.
- ChaosEsque Anthology - FPS with few limitations and much content.
- Digital Paint: Paintball 2 - Fast-paced FPS with several styles of gameplay.
- Freedoom - A complete free content game based on the Doom engine.
- Reaction - FPS that combines action and realism; with a specific emphasis on action over realism.
- Red Eclipse - A free arena shooter.
- Terminal Overload - Experimental multiplayer FPS.
- Tesseract - FPS focused on instagib deathmatch and capture-the-flag.
- Tremulous - Team-based FPS with RTS elements.
- TrueCombat: Elite - Tactical-teamplay oriented, modern-world combat simulation.
- Unvanquished - First-person strategy shooter.
- Urban Terror - a Hollywood tactical shooter.
- Übergame - Realism like, multi-purpose, multiplayer, casual, FPS game.
- Warsow - Fast-paced FPS set in a futuristic cartoonish world.
- Quetoo - Quake 2-like FPS.
- Xonotic - The free and fast arena shooter.
- Music / Rhythm
- Party
- Hedgewars - Turn based strategy, artillery, action and comedy game.
- Open Party - A collection of games for 2 - 4 players.
- Super Tux Party - An open-source party game.
- Platformer
- Clonepoint - A game in which you hack and punch your way to victory.
- Infinite Tux - A Super Mario Bros clone based on Infinite Mario.
- JVGS - Minimalistic platform game.
- Laundred Sheep - An open-source 3D-platformer / jump-and-run game.
- Nikki and the Robots - 2-dimensional platform game.
- ReTux - Action platformer loosely inspired by the Mario games.
- SDLPoP - An open-source port of Prince of Persia.
- Secret Maryio Chronicles - Two-dimensional platform game.
- SuperTux - Classic 2D jump'n run sidescroller game.
- The Legend of Edgar - A 2D platform game with a persistent world.
- The Secret Chronicles of Dr. M. - 2Dsidecrolling platform game.
- Puzzle
- Flobopuyo - Arcade-like puzzle-game.
- Force: Leashed - A free first person gravity fiddler.
- Frozen Bubble - Puzzle-game where players shoot bubbles.
- HoDoKu - A Sudoku generator/solver/trainer/analyzer.
- Intricacy - A game of competitive puzzle-design.
- Irrlamb - 3D game that probably involves a lot of physics and frustrating gameplay.
- Pingus - A free Lemmings-like puzzle game.
- Simsu - A basic Sudoku game.
- The Butterfly Effect - Physics simulation puzzle game.
- Other
- Balazar Safari Photo - 3D action and puzzle game.
- Bussard - Space flight programming adventure game.
- Empty Epsilon - a spaceship bridge simulator game.
- Lord of the Test - A game for Minetest that adds Lord of the Rings like elements.
- Merc - Open-ended exploration game with a minimalist plot.
- Terasology - Survival and discovery game.
- The Ur-Quan Masters - Story-driven space-exploration adventure game.
- trAInsported - a game about trains, Artificial Intelligence and lots of passengers.
- Voxelands - Sandbox construction game.
- Racing
- Extreme Tux Racer - High speed arctic racing game.
- Maniadrive - Arcade car game on acrobatic tracks.
- Q3Rally - Car racing and combat game.
- Rotorcross - Multirotor racing simulator.
- Speed Dreams - Motorsport simulation.
- SuperTuxKart - 3D kart racing game.
- Trigger Rally - Fast-paced single-player racing game.
- Yorg - Third-person arcade style racing game.
- RPG
- Aurora - A space exploration roguelike game.
- Choria - An MMORPG that's all about grinding and doing chores.
- Classic Blades of Exile - RPG and adventure construction kit.
- Destination Sol - 2D Space Arcade/RPG with Planets.
- Dragon Hunt - Classic graphical role-playing game.
- Dungeon Crawl Stone Soup - Single-player, role-playing roguelike game.
- Dungeon Monkey Eternal - Party-based fantasy roguelike RPG.
- Egoboo - 3D dungeon crawling game.
- Eternal Lands - 3D fantasy MMORPG.
- FLARE - Action RPG.
- FreedroidRPG - Open source role playing game.
- GearHead - Roguelikemecha role playing game.
- Heroine Dusk - Basic dungeon crawl made using an old aesthetic.
- HyperRogue - Roguelike set in a non-Euclidean world.
- Isleward - Moddable MMO Roguelike.
- jClassicRPG - Innovative single-player first-person view RPG.
- Liberation Circuit - Rogue A.I. Simulator.
- ManaPlus - OpenSource 2D MMORPG client.
- Meridian 59 - A classic MMO.
- Open Meridian - Medieval fantasy combat and adventure MMO.
- Pixel Dungeon - Traditional roguelike game with pixel-art graphics and simple interface.
- Planeshift - RPG immersed into a 3D virtual fantasy world.
- Planetary Sanitations Inc. - Roguelike mech dungeon-crawler.
- RogueBox Adventures - Graphical roguelike with strong influences from sandbox games.
- SoulFu - Colorful dungeon crawler.
- Stendhal - Fun friendly and completely free multiplayer online adventure game.
- Story of a Lost Sky - a traditional strategy RPG.
- Summoning Wars - Multiplayer role playing game.
- Tales of Maj'Eyal - Roguelike RPG.
- Tuxemon - Monster fighting RPG.
- RTS
- Battle of Antargis - A medieval realtime strategy game.
- Boson - OpenGL real-time strategy game.
- Bos Wars - Futuristic real time strategy game.
- Code Clash - Fast paced, arcade:ish strategy game.
- Dark Oberon - RTS with textures from models made out of plasticine.
- Dune Legacy - A Dune II clone.
- Gigalomania - 2D Real Time Strategy god game.
- MegaGlest - 3D real-time strategy game.
- Mindustry - A pixelated sandbox tower defense game.
- OpenClonk - A game about mining, settling and fast-paced melees.
- Open Dungeons - RTS similar to the Dungeon Keeper series.
- Pax Britannica - One-button real-time strategy game.
- Tribal Trouble - Realtime strategy game set in the wacky Viking age.
- Turres Monacorum - .
- Unknown Horizons - RTS with emphasis on economy and city building.
- Warzone 2100 - 3D RTS with campaign and multiplayer.
- Widelands - Real-time strategy game with singleplayer campaigns and a multiplayer mode.
- WorldGrower - RPG simulator focused on creating a detailed world, in which actions have consequences.
- Wyrmsun -
- Zero-K - RTS where massive robot armies fight an endless conflict.
- Simulation
- Coldest - Mech combat game.
- Cytopia - Retro pixel-art city building game with a big focus on mods.
- Energy Tycoon - Build your own energy empire!
- FlightGear - Open-source flight simulator.
- FreeRCT - a game which captures the look, feel and gameplay of the popular games RollerCoaster Tycoon 1 and 2.
- Mars Simulation Project - A simulation of future human settlement on the planet Mars.
- Oolite - Open-world space opera.
- Pioneer - Open-ended space adventure game.
- Space Nerds In Space - Cooperative multiplayer networked starship simulator.
- Thrive - A game about a species’ evolution from unicellular organisms to galaxy-wide space travel.
- The Powder Toy - Physics sandbox game.
- Thunder & Lightning - Futuristic Action Flight Simulator.
- Shooter
- Strategy
- Birth of the Empires - Turn-based 4X strategy game set in space.
- FAR Colony - Space strategy game.
- FreeCiv - Empire-building strategy game inspired by the history of human civilization.
- FreeCiv WebGL 3D - Empire-building strategy game inspired by the history of human civilization.
- FreeCol - Turn-based strategy game based on the old game Colonization.
- FreeOrion - Turn-based space empire and galactic conquest game.
- OpenTTD - Transport business simulation game.
- Planet Blupi - strategy and adventure.
- Tanks of Freedom - Turn based strategy in isometric pixel art.
- UFO: Alien Invasion - Squad-based tactical strategy game.
- Visual Novel
- CorsixTH -
- Role playing game creation tool, compatible with RPG Maker 2000/2003 games.
- OpenMW - reimplements and extends the engine that runs the RPG Morrowind.
- OpenRA - Recreates the classic Command & Conquer titles.
- OpenRCT2 - An open-source re-implementation of RollerCoaster Tycoon 2.
- OpenSWE1R - Open source port of Star Wars Episode 1: Racer.
- OpenTomb - Reimplementation of the classic Tomb Raider 1—5 engines.
- Platform Game Engine - Game engine and toolkit for creating platform games.
- Xoreos - Open-source reimplementation of the BioWare Aurora Engine.
- VCMI - Rewrite of the Heroes of Might and Magic III game engine.
- F-Droid - Free installable software catalogue for Android.
- Godot - Multi-platform 2D and 3D open source game engine.
