GNU Go is a program that plays the game of Go, in which players place stones on a grid to form territory or capture other stones. While it can be played directly from the terminal, rendered in ASCII characters, it is also possible to play GNU Go with 3rd party graphical interfaces or even in Emacs. It supports the standard game storage format (SGF, Smart Game Format) and inter-process communication format (GMP, Go Modem Protocol).

You are a robot moving around in a realm filled with ASCII characters. Examine humorously described though useless items as you search for a kitten among them. The theme of this Zen simulation is continued in its documentation.

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.

Abe's Amazing Adventure is a scrolling, platform-jumping, key-collecting, ancient pyramid exploring game, vaguely in the style of similar games for the Commodore+4.

The Powder Toy is a free physics sandbox game, which simulates air pressure and velocity, heat, gravity and a countless number of interactions between different substances! The game provides you with various building materials, liquids, gases and electronic components which can be used to construct complex machines, guns, bombs, realistic terrains and almost anything else. You can then mine them and watch cool explosions, add intricate wirings, play with little stickmen or operate your machine.

QCheckers, formerly known as KCheckers, is a is a Qt version of the classic boardgame checkers (also known as draughts).

Glk defines a portable API for applications with text UIs. It was primarily designed for interactive fiction, but it should be suitable for many interactive text utilities, particularly those based on a command line. This is an implementation of the Glk library which runs in a terminal window, using the curses.h library for screen control.

Tux Paint Config is a graphical configuration editor for Tux Paint.

FIFE is a multi-platform isometric game engine. Python bindings are included allowing users to create games using Python as well as C++.

Grue Hunter is a text adventure game written in Perl. You must make your way through an underground cave system in search of the Grue. Can you capture it and get out alive?

Taisei is a vertical shoot'em up game, in which the player controls one of three characters. While moving through stages, a large number of enemies and even larger amounts of bullets appear that require careful maneuvers to dodge. By shooting the enemies, players receive powerups for their characters, allowing them to shoot even more.

Bambam is a simple baby keyboard (and gamepad) masher application that locks the keyboard and mouse and instead displays bright colors, pictures, and sounds.

Yamagi Quake II is an enhanced client for id Software's Quake II. The main focus is an unchanged single player experience like back in 1997, thus the gameplay and the graphics are unaltered. However the user may use one of the unofficial retexturing packs. In comparison with the official client, over 1000 bugs were fixed and an extensive code audit done, making Yamagi Quake II one of the most solid Quake II implementations available.

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/.

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.

Eboard is a chess board interface for ICS (Internet Chess Servers) and chess engines.

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.

Badass generates false commits for a range of dates, essentially hacking the gamification of contribution graphs on platforms such as Github or Gitlab.

Moonlight is an implementation of NVIDIA's GameStream, as used by the NVIDIA Shield.

In the year 2579, the intergalactic weapons corporation, WEAPCO, has dominated the galaxy. Guide Chris Bainfield and his friend Sid Wilson on their quest to liberate the galaxy from the clutches of WEAPCO. Along the way, you will encounter new foes, make new allies, and assist local rebels in strikes against the evil corporation.

M.A.R.S. is a 2D space shooter with pretty visual effects and attractive physics. Players can battle each other or computer controlled enemies in different game modes such as space ball, death match, team death match, cannon keep, and grave-itation pit.

Freecell Solver is a program that automatically solves layouts of Freecell and similar variants of Card Solitaire such as Eight Off, Forecell, and Seahaven Towers, as well as Simple Simon boards.

LTris is a tetris clone: differently shaped blocks are falling down the rectangular playing field and can be moved sideways or rotated by 90 degree units with the aim of building lines without gaps which then disappear (causing any block above the deleted line to fall down). LTris has three game modes: In Classic you play until the stack of blocks reaches the top of the playing field and no new blocks can enter. In Figures the playing field is reset to a new figure each level and later on tiles and lines suddenly appear. In Multiplayer up to three players (either human or CPU) compete with each other sending removed lines to all opponents. There is also a Demo mode in which you can watch your CPU playing while enjoying a cup of tea!

Seven Kingdoms, designed by Trevor Chan, brings a blend of Real-Time Strategy with the addition of trade, diplomacy, and espionage. The game enables players to compete against up to six other kingdoms allowing players to conquer opponents by defeating them in war (with troops or machines), capturing their buildings with spies, or offering opponents money for their kingdom.