GNU Chess is a chess engine. It allows you to compete against the computer in a game of chess, either through the default terminal interface or via an external visual interface such as GNU XBoard.

OpenQuest is a two room adventure game that follows two aliens who come to Earth in search of a stolen artifact.

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.

This a tool for Go players which performs the following functions:

• SGF editor,

• Analysis frontend for Leela Zero (or compatible engines),

• GTP interface (to play against an engine),

• IGS client (to play on the internet),

• Export games to a variety of formats.

Golly simulates Conway's Game of Life and many other types of cellular automata. The following features are available:

1. Support for bounded and unbounded universes, with cells of up to 256 states.

2. Support for multiple algorithms, including Bill Gosper's Hashlife algorithm.

3. Loading patterns from BMP, PNG, GIF and TIFF image files.

4. Reading RLE, macrocell, Life 1.05/1.06, dblife and MCell files.

5. Scriptable via Lua or Python.

6. Extracting patterns, rules and scripts from zip files.

7. Downloading patterns, rules and scripts from online archives.

8. Pasting patterns from the clipboard.

9. Unlimited undo/redo.

10. Configurable keyboard shortcuts.

11. Auto fit option to keep patterns within the view.

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

Frotz is an interpreter for Infocom games and other Z-machine games in the text adventure/interactive fiction genre. This version of Frotz using SDL fully supports all these versions of the Z-Machine including the graphical version 6. Graphics and sound are created through the use of the SDL libraries. AIFF sound effects and music in MOD and OGG formats are supported when packaged in Blorb container files or optionally from individual files.

Adanaxis is a fast-moving first person shooter set in deep space, where the fundamentals of space itself are changed. By adding another dimension to space this game provides an environment with movement in four directions and six planes of rotation. Initially the game explains the 4D control system via a graphical sequence, before moving on to 30 levels of gameplay with numerous enemy, ally, weapon and mission types. Features include simulated 4D texturing, mouse and joystick control, and original music.

The Emilia Pinball Project is a pinball simulator. There are only two levels to play with, but they are very addictive.

Harmonist: Dayoriah Clan Infiltration is a stealth coffee-break roguelike game. The game has a heavy focus on tactical positioning, light and noise mechanisms, making use of various terrain types and cones of view for monsters. Aiming for a replayable streamlined experience, the game avoids complex inventory management and character building, relying on items and player adaptability for character progression.

Doom Runner is yet another launcher of common Doom source ports (like GZDoom, Zandronum, PrBoom, ...) with graphical user interface. It is written in C++ and Qt, and it is designed around the idea of presets for various multi-file modifications to allow one-click switching between them and minimize any repetitive work.

A graphical user interface for the package gnushogi.

Given bridge hands, Lead Solver tallies up how well each card does when led in terms of average tricks taken for the defense (for matchpoints) and how often the contract is set (for team play).

Freeciv is a turn-based empire building strategy game inspired by the history of human civilization. The game commences in prehistory and your mission is to lead your tribe from the Stone Age into the Space Age.

Dungeon Crawl Stone Soup (also known as "Crawl" or DCSS for short) is a roguelike adventure through dungeons filled with dangerous monsters in a quest to find the mystifyingly fabulous Orb of Zot.

GemRB (Game Engine Made with preRendered Background) is a portable reimplementation of the Infinity Engine that underpinned Baldur's Gate, Icewind Dale and Planescape: Torment. It sports a cleaner design, greater extensibility and several innovations.

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.

GNOME Chess provides a 2D board for playing chess games against human or computer players. It supports loading and saving games in Portable Game Notation. To play against a computer, install a chess engine such as chess or stockfish.

Dungeon Crawl Stone Soup (also known as "Crawl" or DCSS for short) is a roguelike adventure through dungeons filled with dangerous monsters in a quest to find the mystifyingly fabulous Orb of Zot.

Tales of Maj’Eyal (ToME) RPG, featuring tactical turn-based combat and advanced character building. Play as one of many unique races and classes in the lore-filled world of Eyal, exploring random dungeons, facing challenging battles, and developing characters with your own tailored mix of abilities and powers.

vkquake is a modern engine for id software's Quake 1. It includes support for 64 bit CPUs, custom music playback, a new sound driver, some graphical niceities, and numerous bug-fixes and other improvements.

GNU Shogi is a program that plays the game Shogi (Japanese Chess). It is similar to standard chess but this variant is far more complicated.

Tetrinet is a multiplayer Tetris-like game with powerups and attacks you can use on opponents.

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