FPS (First Person Shooter)
Optimized Urban Terror - Optimized Urban Terror client binary
Vavoom - Quake-like game
Enemy Territory: Quake Wars (Demo) -
Smokin 'Guns - Quake 3 engine is based on the games of the "Old West's"
OpenArena - A three-dimensional fast-paced first-person shooter

Arcade
Pingus - Game is created based on the game Lemmings (Lemmings)
Frogatto - 2D platformer game starring a quixotic frog
Streets of Rage Remake -
Sonic Robo Blast 2 -
Open Sonic - Game based on the "Sonic the Hedgehog"
Neverball - 3D game with a sloping floor
THE SCND GENESIS - Fighting game bases on webcomic
Xmoto - 2D motocross game
Scorched3d - 3D game artileriyskaya similar Scorched Earth
Legends - Fast-paced FPS online multiplayer game
Wormux - 2D game funny
Lugaru HD - Third-person action game about an anthropomorphic rebel bunny rabbit
Irrlamb - 3D Physics Game
Go Ollie! - Go Ollie!
BZFlag - 3D-game first-person tank battle
SCOURGE - A lot of game platform with open source
AstroMenace - 3d shooter
OpenLieroX - Worms clone with support for online play
Bombic - Like Bomberman Game
Capitan Sevilla - Seville Save from the evil Dr. Torrebruno
Teeworlds - Online 2D shooter
Ardentryst - Action / RPG focused on story and character development
Hedgewars - Playing in the style of Worms
D2X-XL - Descent 2 game port
TORIBASH! - Fighting the new generation
Yo Frankie! - 3D platform game of this generation
Paintown - Paintown 2D fighting game
Secret Maryo Chronicles - A running and jumping games like Super Mario World
Hannah's Horse - Aimed at children playing in the style of Pacman
Rocks'n'Diamonds - Arcade game
SuperTux - 2D arcade classic in the genre of "jump 'n run" in the title role in Tux'om
I Have No Tomatoes - Tomato game of destruction
Armagetron - 3D Tron-like high speed game
Battle Tanks - "Tanks" with multi-user mode and split screen
Extreme Tux Racer - 3D racing game with Tux, the penguin Linux
Atomic tanks - Tank battles
Trackballs - The balls in the maze
LBreakout2 - Game-type ball-and-paddle with nice graphics
Blob Wars: Episode II - Three-dimensional game-shooter
BRIQUOLO - 3d Breakout at a rapid pace
Nikwi - Platform game where your task - to collect candy
Neverputt - 3D Miniature Golf

Arcade
Asylum - A shooter platform
Goonies - Aa remake of the 8-bit 'The Goonies'
Robombs - Free multiplayer 3D game like Bomberman

Logic and Puzzle
PyTraffic - A Python version of Rush Hour
Caph - Playing like "sand box", based on the laws of physics.
Numpty Physics -
OGS Mahjong -

FPS (First Person Shooter)
America's Army - v.2.5.0
Assault Cube - Realistic first-person-shooter
World of Padman - World of Padman Client
Warsow - Fast 3D first-person shooter
Red Eclipse - Single-player and multi-player first-person ego-shooter
Alien Arena - A single 3D online first-person shooter
Enemy Territory - Multiplayer shooter
Blood Frontier - Single and multiplayer first-person shooter
True Combat Elite - An Enemy Territory modification
Tremulous - People against strangers. Command shooter with elements of real-time strategy

Arcade
Steel Storm - Episode I

FPS (First Person Shooter)
Revenge Of The Cats - Fast-paced, team multiplayer FPS
Nexuiz - Swift 3D first-person shooter
Sauerbraten - Shell game 3D first-person

MMORPG (massively multiplayer online role playing)
Savage XR -
Daimonin Online -
RuneScape -
IConquerU -
Auteria Online -
Tibia Online -
Regnum Online -
Online Wakfu -
Eternal Lands - The client package for Eternal Lands, a free MMORPG
Project Diaspora - 2D Space Trading MMORPG

RPG (RPG)
SoulFu - Graphical role-playing game similar to Rogue
Lips Of Suna - Game with elements of action-RPG
Warlock's Gauntlet - Dyablopodobnaya game
Freedroid RPG - RPG based on the isometric Paradroid
The Ur-Quan Masters - Intergalactic Adventure

Logic and Puzzle
Jag - 2D arcade puzzle
OpenAlchemist - Open Alchemist
5Ball - A small application logic
Vertris - Tetris clone
Deadly Cobra - Like the classic game Nibbles (tm)
Zaz - Puzzle game
Biniax-2 - Logic game with arcade and tactical mode
PipeWalker - String any all computers in network
Fish Fillets - Pazlovaya game about witty fish, save the world