Free Gamer
- Open source games blog & list
- http://freegamer.blogspot.com/

Libregamewiki
- The encyclopedia of free (as in freedom) games with free content.
- http://libregamewiki.org/

Holtz - Zertz and Dvonn board games
- Holtz is a GPL implementation of the abstract strategy board games Zèrtz and Dvonn from the GIPF project. (C++) [Linux, Windows] [GPLv2]
- http://holtz.sourceforge.net

CSPoker
- CSPoker is a lightweight poker client/server. Client implementations in Java and Flash. XML-based API. (Java) [GPLv2]
- http://code.google.com/p/cspoker/

PlanetPenguin Racer
- An OpenGL racing game featuring Tux, the Linux mascot. The goal of the game is to slide down a snow- and ice-covered mountain as quickly as possible.(C++,TCL) [Linux,MacOS X]
- http://planetpenguinracer.com

irrlamb
- irrlamb is a 3D game that probably involves a lot of physics and frustrating gameplay. (C++) [Linux, Windows] [GPL2]
- http://code.google.com/p/irrlamb/

Hot Potato Online
- This game is a fast paced arena sport where players try to explode the opposition using a short-fused potato bomb.
- http://hponline.sourceforge.net

OpenLieroX
- OpenLieroX is the open source clone of the famous Liero (the realtime Worms) game.
- http://openlierox.sourceforge.net

GtkPool
- 8-ball pool for Linux with customizable physics.
- http://gtkpool.seul.org/

Daimonin
- Free isometric real-time MMORPG. 2d/3d graphics, 3d sound effects, digital ambient music.
- http://www.daimonin.net

Spice Trade
- Colonize Europe in this Java based, open source game. Live an adventure in the 12th century world.
- http://www.spicetrade.org/

Enigma
- A puzzle game based on oxyd. Runs on Windows, OS X, and most open source operating systems. (C++) [GPL]
- http://www.nongnu.org/enigma/

SecurePlay Open Source Development SDKs
- Build games on Secureplay sourcecode libraries in Flash/Java C++. Create secure game transactions for multiplayer games (player management, state/event control, random events, secret events) Platform independent Encrypted pluggable communications.
- http://www.secureplay.com/products/products.htm

Open Game Source
- A web magazine devoted to open source game development.
- http://www.identicalsoftware.com/ogs/

Flight Gear Flight Simulator
- The FlightGear flight simulator project is an open-source, multi-platform, cooperative flight simulator development project. Source code for the entire project is available. (OpenGL)[OS Independent]
- http://www.flightgear.org/

Right Wing Smackdown Game
- Right Wing Smackdown Game. The game for the whole violent leftist family. For any unix command line, including OS X.
- http://www.lancemiller.org/rightwing_smackdown/

jQuizShow
- Free quiz game based on the "Who Wants to Be a Millionaire" game show. Add your own questions for classroom use or for fun. [Java, OS Independent, GPL]
- http://quizshow.sourceforge.net

Sekoya - open source mmorpg
- Sekoya is a gathering of students trying to develop nice open source games. Our main project is a MMORPG running under Linux and Windows.
- http://sekoya-games.sourceforge.net/

Danger from the Deep
- Danger from the deep (aka dangerdeep) is a Free / Open Source World War II german submarine simulation. [Linux / Windows] (C++)
- http://dangerdeep.sourceforge.net

Groundfire
- A 2D real-time multiplayer tank battling game. (C++) [Windows 9X/2000/XP, Linux]
- http://www.groundfire.net/

Final Frontier Trader
- 2D single player space strategy, combat, and trading game. (C++) [OS Independent]
- http://fftrader.sourceforge.net

FreeDroid
- Clone of the classic game "Paradroid". (C, Python) [MacOS, Windows 95/98/2000, Linux]
- http://freedroid.sourceforge.net/

The Genius
- Chess engine including artificial intelligence, user interface and several features.
- http://thegenius.sourceforge.net

K2W RPG
- A collection of open source client, server, and editor to build online role playing games.
- http://www.k2wrpg.org/

Snip
- Open-source Tetris implementation.
- http://snip.sourceforge.net

Adonthell
- A fantasy RPG game available for Linux, FreeBSD and BeOS. MacOS and Windows support will come soon.
- http://adonthell.linuxgames.com

Linux Game Development Center
- The LGDC provides concise and accurate articles about Linux gaming news, development tutorials, and reviews of the latest tools and resources.
- http://lgdc.sunsite.dk

Playing the Open Source Game
- Shawn Hargreaves has several Open Source projects and interesting articles about the future of Open Source games.
- http://www.talula.demon.co.uk

Hawk Software
- Developer of the open source HAWK game engine, and the OpenNL portable networking library for Windows.
- http://www.hawksoft.com/

Fate
- A massive multiplayer space trading and combat game for Linux. [GPL]
- http://fate.sourceforge.net/