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SourMUD is a Java-based RPG with a client to server relationship, a streamlined update system, an easy way to add content, and a dedicated group of developers. Do the math.
Math game where up to 4 students can play online against each other. By moving their figurines around a colorful pseudo 3D board, players answer math questions and can play tricks against their opponents. Client and server distributed under Affero GPL 1.
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A recreation of Mazewar, as it originally ran on an Imlac PDS-1 in the mid-1970's, and some Imlac cross-development tools.
This consists of a client program, written in C++, which runs on Windows/XP (at least), and a server program, written in Java.
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.
FIGS, open and fun! GPL/java game server for many games, and a graphical client. Server works for 16/19 chess variants,adding go, rating system, and haskell AI client soon.
AOJava: the java implementation of Argentum Online (http://sourceforge.net/projects/morgoao/). It's a 2D non-isometric MMORPG game.
The goal is create a 100% compatible client & server of the original VB6/DirectX game.
OSpora is an open source java based 2 dimensional client/server mmpog based off of a game released in 1998 called Diaspora. After the game went down, the players have taken it upon themselves to create new versions. This is merely an open source version
Jiso Game3 was a 2D isometric MMORPG project (client/server) written in Java with an Ancient Greece theme. The project is no longer active, but the source code is being made available under a BSD license for anyone who might find it useful.
Yet another implementation of the BloodBowl board game. It uses a client/server setup similar to MegaMek to enable network play. The aim is to fully implement all rules from the Living Rulebook.
SwingKore. Under development. Visual Plugin for OpenKore, writtin in Java 5. It will clone Ragnarok Client windows. Simmilar to VisualKore and Revemu, but OpenSource. It works by Client & Server system. Home: http://www.levelbot.org/
Last Online is a free and open-sourced MMORPG game. It consists in two main modules, a server and a client to play with. It is inspired by Ultima Online game but tries to implements a new gameplay and a better gaming experience.
GTADS is an open source multiplayer server and client suite to allow players of GTA1, GTA2, and other Lan based games to play each other in a convenient and efficient fashion.
Mythwaves is a modular mud suite written in Java. It is composed of a server, a client, and a builder tool. Modularity allows you to create new modules and install them using the provided installer.
Open Hold em is a java-based, server and client environment for hosting your own texas hold poker tournaments, and regular tables. It is full customizable and deployable in a number of different java-based hosting environments.
EmuLinker is a fully featured Kaillera network server. Kaillera is a client/server system that virtually any emulator can implement to enable network play, by mapping "Player 2" input to another user over the Internet using UDP network communication.
NuMMoG is an effort to make a massively multiplayer server and client, utilizing (at first) ASCII-based graphics then expanding to 2D or 3D graphics at a later date as project interest increases.
Tythalos is a project for constructing an MMORPG game (and framework) using Java EE 1.4 as server platform and MS .Net C# for the client software. The original theme of the game will be "medieval fantasy" but the framework itself will be reusable.