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.

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?

DFArc makes it easy to play and manage the GNU FreeDink game and its numerous D-Mods.

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.

Pilot your ship inside a planet to find and rescue the colonists trapped inside the Zenith Colony.

In SuperStarfighter, up to four local players compete in a 2D arena with fast-moving ships and missiles. Different game types are available, as well as a single-player mode with AI-controlled ships.

Slime Volley is a 2D arcade-oriented volleyball simulation, in the spirit of some Java games of the same name.

Two teams, 1-3 players each, try to be the first to get 10 points. This happens when the one ball touches the floor on the other side of the net. There can be 1 to 8 balls in game. Once one ball touches the ground, the set ends and all balls are served again.

The GNU Talk Filters are programs that convert English text into stereotyped or otherwise humorous dialects. The filters are provided as a C library, so they can easily be integrated into other programs.

Leela-zero is a Go engine with no human-provided knowledge, modeled after the AlphaGo Zero paper. The current best network weights file for the engine can be downloaded from https://zero.sjeng.org/best-network.

Crispy Doom is a friendly fork of Chocolate Doom that provides a higher display resolution, removes the static limits of the Doom engine and offers further optional visual, tactical and physical enhancements while remaining entirely config file, savegame, netplay and demo compatible with the original.

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.

Tux Paint is a free drawing program designed for young children (kids ages 3 and up). It has a simple, easy-to-use interface; fun sound effects; and an encouraging cartoon mascot who helps guide children as they use the program. It provides a blank canvas and a variety of drawing tools to help your child be creative.

Solarus Quest Editor is a graphical user interface to create and modify quests for the Solarus engine.

This is a clone of the classic game BurgerTime. In it, you play the part of a chef who must create burgers by stepping repeatedly on the ingredients until they fall into place. And to make things more complicated, you also must avoid evil animate food items while performing this task, with nothing but your trusty pepper shaker to protect you.

Liquid War 6 is a unique multiplayer war game. Your army is a blob of liquid and you have to try and eat your opponents. Rules are very simple yet original, they have been invented by Thomas Colcombet.

libsquish is a lossy software DXT texture compression library. It implements the 3 useful DXT flavours (1,3,5) and has SIMD support for x86 (SSE) and powerpc (Altivec). It can be used (as a much slower software fallback) instead of the hardware implementations present on most modern graphics chips.

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.

TORCS stands for The Open Racing Car Simulator. It can be used as an ordinary car racing game, as an artificial intelligence (AI) racing game, or as a research platform. The game has features such as:

• Input support for a driving wheel, joystick, keyboard or mouse

• More than 30 car models

• 30 tracks

• 50 opponents to race against

• Lighting, smoke, skidmarks and glowing brake disks graphics

• Simple damage model and collisions

• Tire and wheel properties (springs, dampers, stiffness, etc.)

• Aerodynamics (ground effect, spoilers, etc.)

The difficulty level can be configured, impacting how much damage is caused by collisions and the level of traction the car has on the track, which makes the game fun for both novice and experts.

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.

You pilot your ship through the dreaded "Maelstrom" asteroid belt -- suddenly your best friend thrusts towards you and fires, directly at your cockpit. You raise your shields just in time, and the battle is joined.

Maelstrom is a free software port of the original shareware game for the Macintosh by Ambrosia Software, Inc. It is a fast-action, asteroids-like game, with classic pixel graphics and original sounds.

In addition to being a faithful reproduction of the original game, this version adds game controller support, mobile touch controls, and both cooperative and competitive multiplayer action.

Passage is meant to be a memento mori game. It presents an entire life, from young adulthood through old age and death, in the span of five minutes. Of course, it's a game, not a painting or a film, so the choices that you make as the player are crucial. There's no ``right'' way to play Passage, just as there's no right way to interpret it.

The OpenGFX project is an implementation of the OpenTTD base graphics set that aims to ensure the best possible out-of-the-box experience.

OpenGFX provides you with...

1. All graphics you need to enjoy OpenTTD.

2. Uniquely drawn rail vehicles for every climate.

3. Completely snow-aware rivers.

4. Different river and sea water.

5. Snow-aware buoys.

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

Alien Blaster is an action-loaded 2D arcade shooter game. Your mission in the game is simple: stop the invasion of the aliens by blasting them. Simultaneous two-player mode is available.