GNU Typist is a universal typing tutor. It can be used to learn and practice touch-typing. Several tutorials are included; in addition to tutorials for the standard QWERTY layout, there are also tutorials for the alternative layouts Dvorak and Colemak, as well as for the numpad. Tutorials are primarily in English, however some in other languages are provided.

Blobwars: Metal Blob Solid is a 2D platform game, the first in the Blobwars series. You take on the role of a fearless Blob agent. Your mission is to infiltrate various enemy bases and rescue as many MIAs as possible, while battling many vicious aliens.

apricots is a game where you fly a little plane around the screen and shoot things and drop bombs on enemy targets. It's meant to be quick and fun.

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.

Endless Sky is a 2D space trading and combat game. Explore other star systems. Earn money by trading, carrying passengers, or completing missions. Use your earnings to buy a better ship or to upgrade the weapons and engines on your current one. Blow up pirates. Take sides in a civil war. Or leave human space behind and hope to find friendly aliens whose culture is more civilized than your own.

Woof! is a continuation of the MBF lineage of Doom source ports, with modern features such as dynamic resolution scaling, uncapped framerates, adjustable field of view, 3D audio with HRTF and 7.1 surround sound support, and modern gamepad features including rumble, gyro, and flick stick support. Supports the new MBF21 format, as well as the MUSINFO, UMAPINFO, DEHEXTRA, and DSDHacked specifictions.

Quakespasm 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.

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

The player controls a character (one of three: Good, Bad, and Dead), dodges the missiles (lots of it cover the screen, but the character's hitbox is very small), and shoot at the adversaries that keep appear on the screen.

These are the BSD games.

Action: atc (keep the airplanes safe), hack (explore the dangerous Dungeon), hunt (kill the others for the Pair of Boots, multi-player only), robots (avoid the evil robots), sail (game of naval warfare with wooden ships), snake (steal the $$ from the cave, anger the snake, and get out alive), tetris (game of lining up the falling bricks of different shapes), and worm (eat, grow big, and neither bite your tail, nor ram the wall).

Amusements: banner (prints a large banner), bcd & morse & ppt (print a punch card, or paper tape, or Morse codes), caesar & rot13 (ciphers and deciphers the input), factor (factorizes a number), number (translates numbers into text), pig (translates from English to Pig Latin), pom (should print the Moon's phase), primes (generates primes), rain & worms (plays an screen-saver in terminal), random (prints randomly chosen lines from files, or returns a random exit-code), and wtf (explains what do some acronyms mean).

Board: backgammon (lead the men out of board faster than the friend do), boggle (find the words in the square of letters), dab (game of dots and boxes), gomoku (game of five in a row), hangman (guess a word before man is hanged), and monop (game of monopoly, hot-seat only). Also the card-games: canfield, cribbage, fish (juniors game), and mille.

Quests: adventure (search for treasures with the help of wizard), battlestar (explore the world around, starting from dying spaceship), phantasia (role-play as an rogue), trek (hunt the Klingons, and save the Federation), and wump (hunt the big smelly Wumpus in a dark cave).

Quizzes: arithmetic and quiz.

Odamex is a modification of the Doom engine that allows players to easily join servers dedicated to playing Doom online.

GNU FreeDink is a free and portable re-implementation of the engine for the role-playing game Dink Smallwood. It supports not only the original game data files but it also supports user-produced game mods or "D-Mods". To that extent, it also includes a front-end for managing all of your D-Mods.

GNUbik is a puzzle game in which you must manipulate a cube to make each of its faces have a uniform color. The game is customizable, allowing you to set the size of the cube (the default is 3x3) or to change the colors. You may even apply photos to the faces instead of colors. The game is scriptable with Guile.

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.

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.

Naev is a 2d action/rpg space game that combines elements from the action, RPG and simulation genres. You pilot a spaceship from a top-down perspective, and are more or less free to do what you want. As the genre name implies, you’re able to trade and engage in combat at will. Beyond that, there’s an ever-growing number of story-line missions, equipment, and ships; even the galaxy itself grows larger with each release. For the literacy-inclined, there are large amounts of lore accompanying everything from planets to equipment.

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.

In Widelands, you are the regent of a small clan. You start out with nothing but your headquarters, where all your resources are stored.

In the course of the game, you will build an ever growing settlement. Every member of your clan will do his or her part to produce more resources---wood, food, iron, gold and more---to further this growth. The economic network is complex and different in the five tribes (Barbarians, Empire, Atlanteans, Frisians and Amazons).

As you are not alone in the world, you will meet other clans sooner or later. Some of them may be friendly and you may eventually trade with them. However, if you want to rule the world, you will have to train soldiers and fight.

Widelands offers single-player mode with different campaigns; the campaigns all tell stories of tribes and their struggle in the Widelands universe! However, settling really starts when you unite with friends over the Internet or LAN to build up new empires together---or to crush each other in the dusts of war. Widelands also offers an Artificial Intelligence to challenge you.

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.

Frozen-Bubble is a clone of the popular Puzzle Bobble game, in which you attempt to shoot bubbles into groups of the same color to cause them to pop.

Players compete as penguins and must use the arrow keys to aim a colored bubble at groups of bubbles. The objective is to clear all the bubbles off the screen before a bubble passes below a line at the bottom.

It features 100 single-player levels, a two-player mode, music and striking graphics. A level editor is also included to allow players to create and play their own levels.

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.

X-Moto is a challenging 2D motocross platform game, where physics play an all important role in the gameplay. You need to control your bike to its limit, if you want to have a chance finishing the more difficult challenges.

Fizmo is a console-based Z-machine interpreter. It is used to play interactive fiction, also known as text adventures, which were implemented either by Infocom or created using the Inform compiler.

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