Open Source Games
Minetest -
An open source voxel game engine. Play one of our many games, mod a game to your liking, make your own game, or play on a multiplayer server. (Minecraft)
Strategy
OpenTTD -
OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe (Transport Tycoon)
0 A.D. -
A free, open-source game of ancient warfare
Cataclysm: Dark Days Ahead -
Cataclysm: Dark Days Ahead is a turn-based survival game set in a post-apocalyptic world. Struggle to survive in a harsh, persistent, procedurally generated world. Scavenge the remnants of a dead civilization for food, equipment, or, if you are lucky, a vehicle with a full tank of gas to get you the hell out of Dodge.
Unciv -
An open source, mod-friendly Android and Desktop remake of Civ V, made with LibGDX (Civilization)
FreeCiv -
Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization. (Civilization)
Warzone 2100 -
A 100% free and open-source 3D real-time strategy game. (Red Alert)
Dungeon Crawl Stone Soup -
An open source roguelike adventure through dungeons filled with dangerous monsters in a quest to find the mystifyingly fabulous Orb of Zot.
Mindustry -
An open-ended factory management game with a focus on tower-defense and RTS elements.
Hedgewars -
Hedgewars is a turn-based strategy, artillery, action and comedy game, featuring the antics of pink hedgehogs with attitude as they battle from the depths of hell to the depths of space. (Worms)
The Ur-Quan Masters -
The Ur-Quan Masters is a re-make of Star Control II, an action-adventure science fiction game set in an open universe. The game includes exploration, resource-gathering, combat, and diplomacy. (Star Control 2)
OpenRA -
Red Alert, Command & Conquer, Dune 2000, Rebuilt for the Modern Era.
UFO: Alien Invasion -
UFO: Alien Invasion is a squad-based tactical strategy game in the tradition of the old X-COM PC games, but with a twist. Our game combines military realism with hard science-fiction and the weirdness of an alien invasion. The carefully constructed turn-based system gives you pin-point control of your squad while maintaining a sense of pace and danger.
Pingus -
Pingus is a free Lemmings™ clone for GNU/Linux, Win32 and other operating systems supported by SDL2. (Lemmings)
MegaGlest -
MegaGlest is an entertaining free (freeware and free software) and open source cross-platform 3D real-time strategy (RTS) game, where you control the armies of one of seven different factions: Tech, Magic, Egypt, Indians, Norsemen, Persian or Romans.
FreeOrion -
FreeOrion is a free, open source, turn-based space empire and galactic conquest (4X) computer game being designed and built by the FreeOrion project. FreeOrion is inspired by the tradition of the Master of Orion games, but is not a clone or remake of that series or any other game.
FPS
Open Arena -
OpenArena is a community-produced deathmatch FPS based on GPL idTech3 technology. There are many game types supported including Free For All, Capture The Flag, Domination, Overload, Harvester, and more.
Xonotic -
Xonotic is an addictive arena-style first person shooter with crisp movement and a wide array of weapons. It combines intuitive mechanics with in-your-face action to elevate your heart rate.
BZFlag -
Free multi-player 3D tank battle game for Windows, Linux, and macOS
Racing
SuperTuxKart -
SuperTuxKart is a 3D open-source arcade racer with a variety characters, tracks, and modes to play. (Mario Kart)
Stunt Rally -
Stunt Rally is a 3D racing game with rally style of driving, mostly on gravel. It features a rich variety of 202 tracks in 37 sceneries also on other planets.
RPG
FreeDroid RPG -
FreedroidRPG features a real time combat system with melee and ranged weapons, fairly similar to the proprietary game Diablo. There is an innovative system of programs that can be run in order to take control of enemy robots, alter their behavior, or improve one's characteristics.