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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.
...One of the game's key features is the fine-tuned balance of hundreds of gameplay parameters, based on player-collected statistics. However, this feature is not yet fully implemented — it requires a server machine, which I currently don’t have due to personal circumstances. If anyone can provide a server machine or a service like Google Virtual Machine, it would be highly useful and greatly appreciated.
The game is written in pure Java using a custom engine. A Java developer or designer is welcome to collaborate on the development.
...
Xivio.com was a commercial children's virtual world website created in 2006 by Gavin Conrad. This is the legacy World Server Java Core made available to the world to do with as it wishes.
Open Source Virtual World and MMOG Development Platform
3D Client (Windows), Server, and Tools to easily create massively multiplayer games and virtual worlds.
If you want to contribute to the source code please go to https://github.com/multiversemmo/MultiversePlatform
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A multiplayer First-Person-Shooter game built in Java 3D
The server can be running anywhere on the network. The players play in a virtual environment among walls and obstacles (walls are porous, beware!). The shots fired at an opponent within range will cause him to lose 'life' points. The target is to kill maximum number of opponents. Once a player is killed he is logged out and then may reenter.
RedDwarf is a horizontally scalable application server for low latency apps such as online games, virtual worlds, and social networking applications. It is the official community fork for Project Darkstar, previously sponsored by Sun Microsystems.
MobileStratego is the online version of Stratego for mobile phones. It's developed with J2ME and it is a two players version. Online playing is achieved using peer-to-peer with virtualserver or direct connection. Single phone is supported too
A Java based virtual Risk-board for internet playing for 2 - 5 players. Contains a client/server UI applet (can also be started as a local application). Includes game saving. Requires a third party chat program for keeping contact with other players.
MMORPG simulating virtual fantasy world. Our concept is "play from anywhere". The game is in *early* development stage. There is still a lot of work to be done.
Pre-alpha test server can be found at http://world7.no-ip.org
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.
This is a 3D networked tank simulation in development. Java3D API (v 1.2) is being
utilized. Using one server to several clients, users will be able to do battle real-time in the
same virtual universe.