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Hypersomnia is a hardcore arena mixing eSports with pixely nostalgia. Every match will be unforgiving - every duel a psychological battle.

Principia is a physics-based sandbox game. Build and play advanced contraptions, circuiting, minigames, robot adventures and more.

In 1999 id Software released the source code to their classic game Doom (under the GNU General Public License). The game as a whole did not get this treatment, however, which means that while the program code that powers Doom is free, the actual content of Doom - graphics, audio, levels, setting and characters - remains proprietary. The Freedoom project aims to fill this gap and create a complete free and libre first person shooter game.

By itself, Freedoom is just the content of a game and must be paired with a Doom-compatible game engine to be played: the download page lists some recommended programs.

MaSzyna is a free train simulator. The program allows you to put yourself in the role of a train driver, currently MaSzyna contains about 40 types of electric and diesel locos, electric multiple units etc. There are also few hundred freight and passager cars availble.

heXon is a free and open source twin-stick-shooter created using the Dry game engine. To score high you must fly well, avoiding the Notyous and destroying them with your Whack-o-Slack blast battery. Your firepower can be increased by collecting five apples. Picking up five hearts in a row will charge your shield. All edges of the hexagonal arena are connected to its opposite like portals, making for a puzzlingly dangerous playing field that might take some experience to wrap your head around.

Lix is an action-puzzle game inspired by Lemmings (DMA Design, 1991) for Windows, Linux, and Mac. It's free and open-source software, placed in the public domain via CC0.

Solve over 700 singleplayer puzzles. Play real-time multiplayer. Design your own levels.