The Freedoom project aims to create a complete free content first person shooter game. Freedoom by itself is just the raw material for a game: it must be paired with a compatible game engine (such as prboom-plus) to be played. Freedoom complements the Doom engine with free levels, artwork, sound effects and music to make a completely free game.

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.

Schiffbruch is a mix of building, strategy and adventure and gets played with a two-dimensional view. The game deals with the consequences of a ship wreckage. You're stranded on a desert island and have to survive. In order to do so you need to explore the island, find food, build a shelter and try to get attention, so you get found.

Glulx is a 32-bit portable virtual machine intended for writing and playing interactive fiction. It was designed by Andrew Plotkin to relieve some of the restrictions in the venerable Z-machine format. This is the reference interpreter, using the Glk API.

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/.

Superfluous Returnz is a 2D puzzle game set in a colourful cartoon universe. It takes place in the very quiet French village of Fochougny, an open world where players solve puzzles, find secret codes and talk to the village people to solve the mystery of the apple thief. The game is licensed as Free Software and asks for a financial donation through the game site.

0ad-data provides the data files required by the game 0ad.

C-Dogs SDL is a classic overhead run-and-gun game, supporting up to 4 players in co-op and deathmatch modes. Customize your player, choose from many weapons, and blast, slide and slash your way through over 100 user-created campaigns.

This package provides a work-in-progress game where you control a Viking and your objective is to loot all of the occupied hexagonal tiles in the map.

PipeWalker is a simple puzzle game with many different themes: connect all computers to one network server, bring water from a source to the taps, etc. The underlying mechanism is always the same: you must turn each tile in the grid in the right direction to combine all components into a single circuit. Every puzzle has a complete solution, although there may be more than one.

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.

Fifechan is a lightweight cross platform GUI library written in C++ specifically designed for games. It has a built in set of extendable GUI Widgets, and allows users to create more.

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.

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

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

Provides a large set of Go-related services for X11:

• Local games with precise implementation of the Chinese and Japanese rulesets

• Edition and visualization of SGF files

• Connection to the NNGS or IGS Go servers

• Bridge to Go modem protocol, allowing to play against Go modem-capable AIs such as GnuGo.

Speed Dreams is a car racing simulator featuring high-quality 3D graphics and an accurate physics engine, aiming for maximum realism. Initially forked from TORCS, it features improvements to the graphics and physics simulation, and supports modern input methods such as gamepads by use of the SDL library. It features more than 20 tracks and more than 80 cars to race with. Extra (freely licensed) assets can be downloaded via the in-game download manager.

L'Abbaye des Morts is a 2D platform game set in 13th century France. The Cathars, who preach about good Christian beliefs, were being expelled by the Catholic Church out of the Languedoc region in France. One of them, called Jean Raymond, found an old church in which to hide, not knowing that beneath its ruins lay buried an ancient evil.

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.

Solarus is a 2D game engine written in C++, that can run games scripted in Lua. It has been designed with 16-bit classic Action-RPGs in mind.

Gamine is a game designed for young children who are learning to use the mouse and keyboard. The child uses the mouse to draw colored dots and lines on the screen and keyboard to display letters.

GNOME 2048 provides a 2D grid for playing 2048, a single-player sliding tile puzzle game. The objective of the game is to merge together adjacent tiles of the same number until the sum of 2048 is achieved in one tile.

XEvil is a violent third-person, side-scrolling, fast-action deathmatch. You run around a randomly generated two-dimensional map composed of walls, floors, ladders, doors, and horizontal and vertical elevators. Your only object is to explore this world to find weapons and items, killing everything in sight before they kill you. You can fight against either computer-controlled enemies or against other people.

FreeRCT is a game that captures the look and feel of the popular games RollerCoaster Tycoon 1 and 2, graphics- and gameplay-wise.

In this game, you play as a manager of a theme park, allowing you to make a park of your dreams. The list of responsibilities includes managing staff, finances, landscaping, and most importantly: rides. Good managers follow the principle of prioritizing the guests' happiness with a well-maintained park. Should they go unwise, a theme park plunge into chaos with vandalizing guests and unsafe rides. Which path will you take?