...It's not completed yet (though fully playable), but is developed actively and gets improved every day. Not only you can play it, you are also able to create your own locations with a built-in editor and custom quests with a dedicated scripting language.
Hale is a turn based RPG with deep tactical combat and character customization. Included is a lengthy and varied campaign with many quests, items and monsters, visiting a variety of locales. The entire system is built to be moddable from the ground up.
A multiplayer RPG that connects as a psuedo server to an IRCD. Built in the tradition of old BBS Door games such as LORD (http://en.wikipedia.org/wiki/Legend_of_the_Red_Dragon). Forest fights add experience and gold needed to best your master (gain level
Deuteros X is set to resurrect Deuteros - and expand upon it. It is being built from scratch, faithfully recreating every aspect of what we consider one of the most enthralling games of all time.
tXtFL is a strategy-based football simulator. Teams can be created from real stats on the web, built through custom designed plays, and then used to coach games or predict scores. Note that as of 2010, all new development is taking place at http://textflex.com/txtfl.
Prequel to my game Plague-RPG, Plague: The Outbreak is built in Python and is a open world based texted based RPG set in the start of a Zombie Outbreak. The player can go anywhere in the world looting and rebuilding, each world is generated randomly.
Diplomacy is a popular turn based strategy game in which you battle to control Europe; to win you must be diplomatic and strategic. webDiplomacy lets you play Diplomacy online. Official game server: http://webdiplomacy.net/
REMLAB is a fully functional cross-platform web-based Battlemech designer for the tactical board game Battletech. REMLAB is built entirely on HTML, PHP, and JavaScript with Ajax functionality.
Battle Star Wars TCG is a program to play the Star Wars trading card game online. It uses all the official trading cards from the Wizards of the Coast expansions and the IDC expansions. Eventually an AI will be built so you can play against the computer.
Generate interest, access liquidity without selling, and execute trades seamlessly. All in one platform.
Geographic restrictions, eligibility, and terms apply.
easyGM is a toolset for GameMasters. It creates a virtual tabletop on which you can store information, roll dice, and create maps. It has lots of tools to begin with and can be extended using it's built in module system.
Pangaea will be a robust and feature filled game engine built using Allegro (http://alleg.sourceforge.net) It will be similar to Final Fantasy 1-3, etc., complete with map editor/world builder.
...This project houses both Version 1(Perl, C++, and Flat text Files), and Version 2(PHP, Python, C++, and Various SQL databases). Our game already features a 2-D map, built-in alliances, and more!
AWSOME stands for “Advanced War Strategies Online Multiplayer Edition” and is a open source clone of the “Advance Wars” series available for handhelds. It features the original game modes, a built-in map editor and a multiplayer mode via Internet