Box2D is a 2D rigid body simulation library for games. Programmers can use it in their games to make objects move in realistic ways and make the game world more interactive. From the game engine's point of view, a physics engine is just a system for procedural animation.

CSFML is the official C binding to the SFML libraries. SFML provides a simple interface to the various computer components, to ease the development of games and multimedia applications. It is composed of five modules: system, window, graphics, audio and network.

LÖVE is a framework for making 2D games in the Lua programming language.

Godot is an advanced multi-platform game engine written in C++. If features design tools such as a visual editor, can import 3D models and provide high-quality 3D rendering, it contains an animation editor, and can be scripted in a Python-like language.

Tsukundere is a game engine geared heavily towards the development of visual novels, written on top of Guile-SDL2. It is still experimental.

Sfxr is a tool for quickly generating simple sound effects. Originally created for use in video game prototypes, it can generate random sounds from presets such as "explosion" or "powerup".

The Graphics Resource File (GRF) development tools are a set of tools for developing (New)GRFs. It includes a number of smaller programs, each with a specific task:

1. grfcodec decodes and encodes GRF files for OpenTTD.

2. grfid extracts the so-called "GRF ID" from a GRF.

3. grfstrip strips all sprites from a GRF.

4. nforenum checks NFO code for errors, making corrections when necessary.

dhewm3 is a source port of the original Doom 3 engine (not Doom 3: BFG Edition), also known as id Tech 4. Compared to the original version of the Doom 3 engine, dhewm3 has many bugfixes, supports EAX-like sound effects on all operating systems and hardware (via OpenAL Softs EFX support), has much better support for widescreen resolutions and has 64bit support.

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

MegaGlest is a cross-platform 3D real-time strategy (RTS) game, where you control the armies of one of seven different factions: Tech, Magic, Egypt, Indians, Norsemen, Persian or Romans.

Bastet (short for Bastard Tetris) is a simple ncurses-based falling brick game. Unlike normal Tetris, Bastet does not choose the next brick at random. Instead, it uses a special algorithm to choose the worst brick possible.

Playing bastet can be a painful experience, especially if you usually make canyons and wait for the long I-shaped block to clear four rows at a time.

POWWOW is a client software which can be used for telnet as well as for Multi-User Dungeon (MUD). Additionally it can serve as a nice client for the chat server psyced with the specific config located at http://lavachat.symlynx.com/unix/

Black-hole Solver is a program that automatically solves layouts of Black Hole and similar variants of Card Solitaire such as Golf, and All in a Row.

The GNU backgammon application (also known as "gnubg") can be used for playing, analyzing and teaching the game. It has an advanced evaluation engine based on artificial neural networks suitable for both beginners and advanced players. In addition to a command-line interface, it also features an attractive, 3D representation of the playing board.

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.

Xonotic is a free, fast-paced first-person shooter. The project is geared towards providing addictive arena shooter gameplay which is all spawned and driven by the community itself. Xonotic is a direct successor of the Nexuiz project with years of development between them, and it aims to become the best possible open-source FPS of its kind.

Enigma is a puzzle game with 550 unique levels. The object of the game is to find and uncover pairs of identically colored ‘Oxyd’ stones. Simple? Yes. Easy? Certainly not! Hidden traps, vast mazes, laser beams, and most of all, countless hairy puzzles usually block your direct way to the Oxyd stones. Enigma’s game objects (and there are hundreds of them, lest you get bored) interact in many unexpected ways, and since many of them follow the laws of physics (Enigma’s special laws of physics, that is), controlling them with the mouse isn’t always trivial.

Pingus is a free Lemmings-like puzzle game in which the player takes command of a bunch of small animals and has to guide them through levels. Since the animals walk on their own, the player can only influence them by giving them commands, like build a bridge, dig a hole, or redirect all animals in the other direction. Multiple such commands are necessary to reach the level's exit. The game is presented in a 2D side view.

Fork of Julius, an engine for the a city-building real-time strategy game Caesar III. Gameplay enhancements include:

• roadblocks;

• market special orders;

• global labour pool;

• partial warehouse storage;

• increased game limits;

• zoom controls.

Exult is an Ultima 7 game engine that runs on modern operating systems. Ultima 7 (or Ultima VII) is a two-part RPG from the early 1990s.

Exult is fully compatible with the original Ultima 7, but doesn't require any of its data files to be useful. Explore entirely new game worlds---or create your own with the included game and map editor, Exult Studio.

This package expects the game(s) to be placed in subdirectories of ~/.local/share/exult.

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.

fheroes2 is an implementation of Heroes of Might and Magic II (aka HOMM2) game engine. It requires assets and game resources to play; it will look for them at ~/.local/share/fheroes2 folder.

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.

Libmanette is a small GObject library giving you simple access to game controllers. It supports the de-facto standard gamepads as defined by the W3C standard Gamepad specification or as implemented by the SDL GameController.