Realms of Kaos - Features message boards, rules, chats, downloads and FAQs. - http://realmsofkaos.com/
Dark Ages II: Engel - Medieval Windows game in which three thieves must solve the mystery that unravels when they are betrayed by their guild. - http://dk-software.com/
Zelda Classic - Replica for Windows of NES version of The Legend of Zelda. Includes development notes, download, enemy list, walkthroughs, and FAQ. - http://www.zeldaclassic.com
Wheel Of Time - Light And Shadow - An online virtual community in Java based on Robert Jordan's Wheel of Time books. [Open Source, GPL] - http://wotlas.sourceforge.net
IRE - User-editable clone of Ultima 6 for DOS, Windows, BeOS, or Linux. (Open Source, BSD) - http://ire.sourceforge.net/
Dungeon Game - 3D dungeon crawler for Windows or Linux. - http://tempusmud.com/~jwatson/sdl-dg/
Progress Quest - Players build their character from a ninety-pound level one teenager, to a warrior, well able to snuff out the lives of a barnload of bugbears without need of so much as a lunch break. (Windows) - http://www.progressquest.com/
Umbra - Free humanity in a randomly-generated world. (Requires Python) - http://kuoi.asui.uidaho.edu/~kamikaze/Umbra/
Lost Hero - A classic-style Java-based game, with information and download. - http://losthero.sourceforge.net/
Faldon - Online role playing game for Windows with equipment, items, magic, skills, levels, experience, and a real-time battle system. - http://www.illusorystudios.com/faldon/
Exult - Version of Ultima VII for Unix, Windows, Mac, BeOS. - http://exult.sourceforge.net/
DimensioneX Multiplayer Adventure Development Kit - Offers a freeware Java software capable of building and running multiplayer adventure games, playable with any browser. Several multiplayer games are available for free as a demo. - http://www.dimensionex.net/en/
K2W RPG - A collection of open source client, server, and editor you can use to build and run your own online RPG. - http://www.k2wrpg.org/