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The overview includes only games which are completely free, with a permissive license for both the code and their content. I could not include here games like Urban Terror or Warsow, since their assets are not free, nor Steam games.

0 A.D.

A very beautiful game, 0 A.D. is a 3D medieval strategy game with different nations, incorporating elements from various other games pertaining to the genre, like Age of Empires. Still in alpha stage (and has been for a long time), 0 A.D. is playable in both single-player and online. It has great graphics, specific units and buildings for each faction, and a selection of carefully designed maps.


Red Eclipse

Red Eclipse is a shooter game set in futuristic environments, including many modes, game mutators, and trickjumps like dashing or impulse boosts. Just like Sauerbraten below, it’s based on the Cube 2 engine.
Homepage | Full Review



Hedgewars is a Worms-like game which preserves the original feeling, but brings some really neat features like user registration and online playing, new maps, game modes, sounds and graphics. For the fans of the Worms series, this is definitely a really good, free alternative.
Homepage | Full Review


Battle for Wesnoth

This a the very popular and very addictive turn-based game. The Battle for Wesnoth takes place in fantasy universes, with 7 different factions available, and battles taking place over hexagonal tiles, with different unit abilities, traits and terrain defenses. Although it has some simple rules, the gameplay can be very dynamic and complex, with matches ranging from minutes up to hours.
Homepage | Full Review



OpenArena takes the ioQuake3 engine and replaces all the Quake 3 assets with free ones. The result is a completely free Quake 3 clone, with its own maps, player and weapon models, sounds, and a good online playing experience. OpenArena brings some really nice game modes, including mutators (like Rocket-only mutator or Instantgib mutator).



This is a Mario clone with Tux as the protagonist. SuperTux includes several missions with lots of levels, all the monsters and techniques specific to the genre.


Warzone 2100

This is a real-time strategy game focused on research of new technologies, with a very ample tech-tree due to the available possibilities.
Homepage | Full Review



This is based on the Cube engine, it is a first-person shooter game somewhat different than the casual players. There are lots of maps, weapons and especially game modes, like the popular CTF ones (including Keep the Flag or Hunt the Flag) or the One Shot, One Kill one. Trickjumps are also possible, and they are a bit different in AC in that you can also use the so-called “rifle jumps” to propel yourself higher.
Homepage | Full Review | Guide


Stunt Rally

Based on the VDrift and OGRE engines, Stunt Rally is a 3D-intensive racing game with beautiful scenery and several interesting tracks.



This is a ball-driving game, with the goal of running the ball all over various maps and collecting all the gold without falling off. Neverball can be real fun to play, however it requires great skills and tricks in order to master it, especially on high-difficulty levels.



Supertuxkart is a popular racing game with a funny twist. You can choose from various missions and complete different tasks to unlock more tracks. It’s quite a nice compared to all the more “serious” racing games.



Based on the Cube 2 engine, Sauerbraten is a shooter that provides a bunch of game modes, ranging from DM to the CTF family or Instagib.
Homepage | Full Review


A few more to include here: Alien Arena, Tremulous or World of Padman (all of which are first-person shooters with a Sci-Fi flavour).

Although not completely open-source due to a less permissive assets license, worth mentioning are also Xonotic, Urban Terror and Warsow.

Have some more? Please share them in the comments below.

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niffiwan says:

You may want to have a look at Diaspora – it’s a space flight sim set in the new Battlestar Galactica universe. Based on the Freespace2_open engine both the code and assest are released under open but non-commercial licenses.

dthlock says:

UFO AI, Free Orion

mzs says:

Love the list.
But, Assault Cube Reloaded is way better than the vanilla version.

Pioneer spacesim is another gem, which is actively developed.

I don’t know whether Project Babylon is FLOSS. But it looks good.


Craciun Dan says:

I’ll have a look at Babylon and Pioneer. Regarding AssaultCube Reloaded, your mileage may vary. When I tried it, ACR only shares the models and maps with the vanilla AC, but the gameplay is completely different (no recoil for example – which is one of AC’s features and most used abilities for trickjumping). Otherwise, it has some really nice effects and some other modifications.

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