The time of Archmages will be an open-source MUD game.
Players can be connected to the game server using either a special client or through IRC or they can use a Web-interface. This means that a player can reach the server from virtually any platform.
An attempt at a Xanalogical Web, comprised of a CGI system with both native and HTML interfaces, a set of standards, a backend supporting Transclusion, versioning, and a custom browser with support for Transpointing and editing.
Emma (Extensible Multi Media Architecture) is an open-source, modular, extensible, dynamic framework for declarative authoring and display of 2D and 3D interactive multimedia. It uses Lua for scripting and Ogre3D for rendering. http://www.emma3d.org
AtreyuMS is a server emulator which replicates the functionality of a MapleStory server. The emulator is cross-platform compatible since it is coded in Java.