Open Source Java Game Engines

VASSAL is a game engine for creating electronic versions of traditional board and card games. It provides support for game piece rendering and interaction, and supports play by email or over a live connection.

XMage allows you to play Magic against one or more online players or computer opponents. It includes full rules enforcement for over 20 000 unique cards and more than 50.000 reprints from different editions. You can also find custom sets like Star Wars. All regular sets have nearly all implemented cards. It supports single matches and tournaments with dozens game modes like duel, multiplayer, standard, modern, commander, pauper, oathbreaker, historic, freeform and much more. Local server supports a special test mode for testing combos and other game situations with pre-defined conditions. There are public servers where you can play XMage against other players. You can also host your own server to play against the AI and/or your friends. Supports special formats like Commander (up to 10 players), Oathbreaker, Cube, Tiny Leaders, Super Standard, Historic Standard and more.

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.

Rails is a Java game engine intended to play any of the 18xx series of turn-based board games For 3-6 players and set in the 19th century, these games allow players to step into the shoes of the robber barons and railroad tycoons of the time period..

Java port of the Quake2 game engine

Kochol Game Engine(KGE) is an object-orianted hardware accelerated 3D Game engine. Easy to use and powerful engine for cutting edge games.

JGame is a small multiplatform 2D game engine. It runs on the Java JRE 1.3+ platform, the J2ME (MIDP2.0/CLDC1.1) mobile platform, and the Android (2.1+) platform. It provides a very high-level framework for "classic" type arcade games.

JURPE (Java Universal Role Playing Engine) is a Java API to support the writing of new computer RPG games based on a skill based, three dice RPG system. It comes with a full featured game demo of a medieval warrior crawling into a monster filled dungeon

AGE is a multi-threaded game engine for Android with OpenGL ES2 shader-based rendering. In-depth GL knowledge isn't necessary to start; use the OBJ loader to import models from Blender and elsewhere, attach textures, and start rendering! Threads run different activities, e.g. initialization, framerate, timer, game cycle. Apartment model with message passing. The drawing cycle is inverted from typical game loops. Framerate has a dedicated timer, and SurfaceView is in on-demand rendering mode. Game Objects (GOs) opt-in to services by implementing the "marker" interface for each one it wants. GOs enter the system via Install Pipeline, an asynchronous "standard" implementation that keys on the marker interfaces and performs the "protocol" for that marker. There are also Event and Uninstall pipelines. Reference by name is encouraged. A trip through the pipeline includes a Bind Name List; allows GO to connect to interfaces in other GOs on the other End.

EasyWay java Game Engine is a powerfull 2D OpenSource OpenGL Java Game Engine. It's simple, fast and extendible. With EasyWay you can make your dream game writing few lines of code!

A new decentralized way of network game-design.. Server-client-client-based with object-streaming. Which means that everyone can run a server with almost no hardware costs. The whole system is built upon a network of trust in within the masterclient delegates tasks.

Gold Chest is a new game engine inspired by the old gold-box styled RPG games. My goal is to create a game with the same Look and Feel of the gold-box games while bringing to it newer graphics, sounds, music and network play.

This is the first step of a board game engine development plan "Architect". The first version will be playing the classical Gomoku game, and this version is called "Architect I". This project also shows the rich features of the next generation Java graphical user interface. The GUI of this application was built using JavaFX 2.0 which was entirely written in Java. Although as been announced, JavaFX 3.0 will be integrated into JRE in next year, at this point, you still need a separate runtime evironment. Be sure to download and install the JavaFX 2.0 runtime before download this game. @2011.10.24

This is a background game framework in java. It is controlled with states, wich can be layed over each other and entities wich can execute triggers when some events occur. The built in console provides some extra enhancement, you can add commands easily to it - same with creating a trigger-function for an entity. It's using java.awt as graphical port. Also using OpenGL from version 0.3.xxx, you can select your desired main class and it runs with the given graphics port. Checkout the git repository for the newest version.. Documentation is in the files.

Cardic - Card and Dice Game Engine. A modular game engine built on NetBeans Platform.

Cardhouse is an online card game engine that supports a wide variety of games. The client is independent of the card game rules and new games can be added to the server without it having to reboot.

Cyber Knight is a game engine for developing educational software for computer science. The platform features an isometric tile engine and a code visualizer for python.

DimensioneX is a free Massive Multiplayer Game Engine. It lets you develop and then run or host browser-based, graphical multiplayer games. The users will play games simply via their browser. DimensioneX runs on any Java-enabled web server (eg. Tomcat)

Eisai is a project to build a Visual Novel game engine and editor and to deploy a visual novel on those developed products. The engine will be licensed with the LGPLv3 and the editor will be covered by the GPLv3. All artwork, music and writing will be covered by the Creative Commons Attribution-ShareAlike license.

A light, Java based 2D game engine. Easy to use, powerful when you need it, no unneeded bells and whistles to slow you down.

A portable game engine, which also allow make applets.

Friendly Object-Oriented Game Library , 2D Java Game Engine based on Slick2D and LWJGL. This library was designed for students and primer Java programmer.

Generic Collectible Card Game is a multiplayer multiplatform implementation of a card game engine. The card game engine is designed to be of general purpose core for several modules each defining the game specific behaviour.

Helen is an adventure game engine written in Java 6, designed to support multiple users. Where Helen attempts to be unique is enabling users with powerful extensibility without a grammar-heavy language (thanks to Groovy).