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.

OpenVR is an API and runtime that allows access to VR hardware from multiple vendors without requiring that applications have specific knowledge of the hardware they are targeting.

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".

Hedgewars is a turn based strategy, artillery, action and comedy game, featuring the antics of pink hedgehogs with attitude as they battle from the depths of hell to the depths of space.

As commander, it's your job to assemble your crack team of hedgehog soldiers and bring the war to your enemy.

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

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.

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.

ManaPlus is a 2D MMORPG client for game servers. It is the only fully supported client for The mana world, Evol Online and Land of fire.

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

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

The Butterfly Effect (tbe) is a game that uses realistic physics simulations to combine lots of simple mechanical elements to achieve a simple goal in the most complex way possible.

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.

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.

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

BZFlag is a 3D multi-player multiplatform tank battle game that allows users to play against each other in a network environment. There are five teams: red, green, blue, purple and rogue (rogue tanks are black). Destroying a player on another team scores a win, while being destroyed or destroying a teammate scores a loss. Rogues have no teammates (not even other rogues), so they cannot shoot teammates and they do not have a team score.

There are two main styles of play: capture-the-flag and free-for-all. In capture-the-flag, each team (except rogues) has a team base and each team with at least one player has a team flag. The object is to capture an enemy team's flag by bringing it to your team's base. This destroys every player on the captured team, subtracts one from that team's score, and adds one to your team's score. In free-for-all, there are no team flags or team bases. The object is simply to get as high a score as possible.

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

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.

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.

UltraStar Deluxe (USDX) is a karaoke game. It allows up to six players to sing along with music using microphones in order to score points, depending on the pitch of the voice and the rhythm of singing.

Freedroid RPG is an RPG (Role-Playing Game) with isometric graphics. The game tells the story of a world destroyed by a conflict between robots and their human masters. To restore peace to humankind, the player must complete numerous quests while fighting off rebelling robots---either by taking control of them, or by simply blasting them to pieces with melee and ranged weapons in real-time combat.

TinTin++ is a MUD client which supports MCCP (Mud Client Compression Protocol), MMCP (Mud Master Chat Protocol), xterm 256 colors, most TELNET options used by MUDs, as well as those required to login via telnet on Linux / Mac OS X servers, and an auto mapper with a VT100 map display.

Lugaru is a third-person action game. The main character, Turner, is an anthropomorphic rebel bunny rabbit with impressive combat skills. In his quest to find those responsible for slaughtering his village, he uncovers a far-reaching conspiracy involving the corrupt leaders of the rabbit republic and the starving wolves from a nearby den. Turner takes it upon himself to fight against their plot and save his fellow rabbits from slavery.

Curse of War is a fast-paced action strategy game originally implemented using ncurses user interface. An SDL graphical version is also available.

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!