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CoffeeMud is a text-based virtual reality game engine (a MUD). It is a mature, full-featured Java codebase. It includes web (HTTP) and email (SMTP) servers, chat (IMC2 and I3) and web clients, and supports ANSI, MXP, and MSP.
VRS is an environment for presenting three dimensional (3D) world. All visualisations are made at client(s) side VRC (Virtual Reality Client - example client is under developement, SF site avaible, see also http://jvrc.info).
MindGate is a virtual reality multiuser client - server system written in Java. The purpose of the system is to provide communication, persistence, 3d streaming support for users which are imersed into virtual reality worlds - stored anywhere on the Web.
A graphical isometric multiplayer virtual reality server in MUD-style. Rooms and server code can be changed online. At the moment, there is also an IRC link. Clients are available in Java and Python/C.