JQuest is intended to be a Java-based clone of the turn-based strategy game Konquest (developed by Russ Steffen), available on KDE for Linux. It is being developed in Java 5.0 (Tiger) and should be portable to most operating systems.
CloneSweeper is a Minesweeper clone written entirely in Java. It was done mostly to improve my understanding of the Java language after 1 semester of OOP in college.
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A WikiWiki clone implemented in ASP with JavaScript. It uses JavaScript Template engine.It's very easy to install and use. Now will migrate to the J2EE platform
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It-opoly is an aim to create a java based it-sector themed network monopoly clone. It will strive to contain all the aspects of monopoly, with an IT twist.
JMSN is a pure Java Microsoft MSN Messenger clone, including Instant messaging, File Send/Receive, msnlib (for developers), and additional chat log etc. JMSN has many interesting features that MSN doesn't have.
mobileTV is a J2ME clone of the game "Mad TV". You manage a TV station and tasks include (among others): planning the program, placing ads & producing your own shows and series. mobileTV requires MIDP 2.0.
PacDasher is a Pac-Man clone which shows that Java is now a good choice
for creating arcade-style games by exploiting new capabilities such as hardware graphics acceleration. Best with J2SE 5.0. See also
http://www.oranda.com/java/pacdasher
JAM is a MSN Mesenger clone written in Java using the SWT Widget Toolkit. It can be run on top of a JVM or (in a not so far future) in native code compiled with gcj.
kurve*online is a java-based multiplayer snake game ("Achtung, die kurve!" - clone)
It will support singleplayer with AI bots, multiplayer on 1 pc+keyboard, online multiplayer or a combination of those 3.
jnocatan is a java-based, cross-platform client for gnocatan. It allows fans of the popular Settlers of Catan clone to now play with friends on any platform supporting java, which is pretty much any platform.
AlgoBros3 is a platform independent MarioBros clone written in Java (J2SDK 1.4), coded to make easily extensible and upgradable.
With most common tile based game features implemented and a nice Look & Feel.
UseModj is a Java based Wiki Clone, using Struts, Velocity Layout, CSS. It's goal is to be the same function and file storage as UseMod wiki, but is deployed by dropping a single war file into Tomcat or JBoss Server and supports file/image attach.
A clone of the old DOS game Commander Keen. It's written in C++ and uses the SDL library so it's mostly platform independent. A map-editor (Java 1.5) is also included.
KNCpong is a Pong clone of the classical arcade game. This game is open source applet written solely in Java. Includes 1 player action against a CPU opponent. As the game progresses, the CPU player will become quicker and smarter. Support for Java 1.3+