Stockfish is a very strong chess engine. It is much stronger than the best human chess grandmasters. It can be used with UCI-compatible GUIs like ChessX.

Warzone 2100 offers campaign, multi-player, and single-player skirmish modes. An extensive tech tree with over 400 different technologies, combined with the unit design system, allows for a wide variety of possible units and tactics.

Kobo Deluxe is an enhanced version of Akira Higuchi's XKobo graphical game for Un*x systems with X11.

This package provides a userspace daemon for the Nintendo Joy-Con controllers.

0 A.D. is a real-time strategy (RTS) game of ancient warfare. It's a historically-based war/economy game that allows players to relive or rewrite the history of twelve ancient civilizations, each depicted at their peak of economic growth and military prowess.

0ad needs a window manager that supports 'Extended Window Manager Hints'.

GNUjump is a simple, yet addictive game in which you must jump from platform to platform to avoid falling, while the platforms drop at faster rates the higher you go. The game features multiplayer, unlimited FPS, smooth floor falling, themeable graphics and sounds, and replays.

Fish Fillets NG is strictly a puzzle game. The goal in every of the seventy levels is always the same: find a safe way out. The fish utter witty remarks about their surroundings, the various inhabitants of their underwater realm quarrel among themselves or comment on the efforts of your fish. The whole game is accompanied by quiet, comforting music.

The GNU Talk Filters are programs that convert English text into stereotyped or otherwise humorous dialects. The filters are provided as a C library, so they can easily be integrated into other programs.

Hex-a-hop is a puzzle game in which a girl has to destroy green hexagons by stepping on them.

Pioneer is a space adventure game set in our galaxy at the turn of the 31st century. The game is open-ended, and you are free to eke out whatever kind of space-faring existence you can think of. Look for fame or fortune by exploring the millions of star systems. Turn to a life of crime as a pirate, smuggler or bounty hunter. Forge and break alliances with the various factions fighting for power, freedom or self-determination. The universe is whatever you make of it.

OpenClonk is a multiplayer action/tactics/skill game. It is often referred to as a mixture of The Settlers and Worms. In a simple 2D antfarm-style landscape, the player controls a crew of Clonks, small but robust humanoid beings. The game encourages free play but the normal goal is to either exploit valuable resources from the earth by building a mine or fight each other on an arena-like map.

With PokerTH you can play the Texas holdem poker game, either against computer opponents or against real players online.

Passage is meant to be a memento mori game. It presents an entire life, from young adulthood through old age and death, in the span of five minutes. Of course, it's a game, not a painting or a film, so the choices that you make as the player are crucial. There's no ``right'' way to play Passage, just as there's no right way to interpret it.

This package provides the GameStream core code for the protocol.

Simon Tatham's Portable Puzzle Collection contains a number of popular puzzle games for one player.

Redeal is a deal generator written in Python. It outputs deals satisfying whatever conditions you specify --- deals with a double void, deals with a strong 2♣ opener opposite a yarborough, etc. Using Bo Haglund's double dummy solver, it can even solve the hands it has generated for you.

The Irrlicht Engine is a high performance realtime 3D engine written in C++. Features include an OpenGL renderer, extensible materials, scene graph management, character animation, particle and other special effects, support for common mesh file formats, and collision detection.

The goal of this logic game is to open all cards in a 6x6 grid, using a number of hints as to their relative position. The game idea is attributed to Albert Einstein.

Armagetron Advanced is a multiplayer game in 3d that attempts to emulate and expand on the lightcycle sequence from the movie Tron. It's an old school arcade game slung into the 21st century. Highlights include a customizable playing arena, HUD, unique graphics, and AI bots. For the more advanced player there are new game modes and a wide variety of physics settings to tweak as well.

This is an open-source port of the Serious Engine from Serious Sam: The First Encounter and Serious Sam: The Second Encounter. This variant includes a Vulkan renderer. To run, you must put your official game data, Levels and Help in ~/.local/share/Serious-Engine/serioussam,serioussamse/gamedata/.

This is a clone of the classic game BurgerTime. In it, you play the part of a chef who must create burgers by stepping repeatedly on the ingredients until they fall into place. And to make things more complicated, you also must avoid evil animate food items while performing this task, with nothing but your trusty pepper shaker to protect you.

This program generates bridge hands. It can be told to generate only hands satisfying conditions like being balanced, having a range of High Cards Points (HCP), controls, or other user-definable properties. Hands can be output in various formats, like PBN for feeding to other bridge programs, Deal itself, or split up into a file per player for practise.

In this game you pilot a combat space ship to rescue your lost "vi" .swp files avoiding OS defenses. It contains several levels and the difficulty level is configurable on the command line. It can be played with a keyboard or a joystick. It is drawn mostly with lines, and supports various display modes.

DSDA-Doom is a Doom source port and successor of PrBoom+, with extra features for demo recording/playback and quality of life. In particular, its features include support for the Heretic, Hexen, MBF21, Doom-in-Hexen and UDMF map formats, MAPINFO support, full controller support, debug and scripting features, rewinding, and a strict mode for speedrunning.