A web-based html chat system. Allows users to chat in multiple rooms, private chat, 2 player games (checkers, tictactoe, chess, etc..)all without any client requirements other than html. Currently server requirements are PHP4 & apache & cron. Platforms: Windows, Mac, Linux

A arcade game. You drive a toy wood engine in many levels. You must collect all the coaches. This game looks like the game snake. Platforms: Windows, BSD, Mac, Linux

A networked, turn-based, whodunit-type game closely modeled after the board game Clue. Platforms: Windows, Mac, Linux

Implements a graphical interface and backend for playing and managing a game of Go (http://senseis.xmp.net/?RulesOfGoIntroductory) between a combination of human and computer players. Includes support of standard protocols, such as GTP and SGF. Platforms: Windows, Mac, Linux

This project is intended as an example implementation of Java with SWT and Draw2D. It is also a pretty good Connect4 game that you play against the computer. Platforms: Windows, Mac, Linux

A multi-player networked clone of the classical Bubble Bobble board game. Throw bubbles at monsters and collect dozens of different bonuses before your co-players! Platforms: Windows, Mac, Linux

MasterMind board game written using wxWidgets.Easy to play interface.Available for all platforms. Platforms: Windows, Mac, Linux

JMorpheus is a highly configurable Othello application. Due to its modular design and well-defined interface, writing a new user interface or a computer opponent with artificial intelligence is an easy task for an intermediate Java programmer. This makes Platforms: Windows, Mac, Linux

Project aimed at making an online application to play Dungeon Dice Monsters online. Complete with all cards/dice released: Japanese, International, and GBA ones; expanding into having the community design more. PREALPHA: No build yet Must use source Platforms: Windows, Mac, Linux

This ain't your daddy's crypto! We provide a set of C libs and utilities to perform cypherpunk style crypto functions, using your existing OpenPGP keys. Ring signatures; credentials; mental poker; timelines; zero knowledge proofs. Cool stuff! Platforms: Windows, BSD, Mac, Linux

JBackgammon is a Java Backgammon game. It allows playing over a network, or both players playing on the same computer. Platforms: Windows, Mac, Linux

'Junes opintoputkessa' (Junes in study tube, literal translation) is a board game of student life and career. It is not a perfect remake, but is very much in the spirit of the legendary Sierra's game Jones in the Fast Lane. Platforms: Windows, Mac, Linux

Scrabble. Cross-platform, remote play, i18n'ed, custom dictionaries with unicode support. Written in Java. Platforms: Windows, Mac, Linux

jDip is a tool for mapping, managing, and adjudicating Diplomacy games. It has a simple but powerful graphical interface, with a richly customizable map display. Windows, Linux, Mac OS X, and Solaris are supported. Over 25 variants are supported. Platforms: Windows, BSD, Mac, Solaris, Linux

Computer version of a simple but addictive, single-player pen&paper game. Platforms: Windows, Mac, Linux

Graphical interface to programs that play the game of Go and use the Go Text Protocol (GTP), such as GNU Go. GoGui has special features that are useful for Go program developers. Platforms: Windows, Mac, Linux

This is a java version of the board game connect4. It functions as a swing application, a java applet, and there is a console application also. Network support is proposed for version 1.1+. Platforms: Windows, BSD, Mac, Linux

A simple application to administer Magic: The Gathering trading cards, esp. for fast manual input of german/english cards. At the moment this application is limited to jdk1.5 Platforms: Windows, Mac, Linux

Players take turns to choose spots on a board, the winner is the 1st player to make the required connection amount in any direction.Features: 2player, networked game, AI, and gameplay settingsOther: Network chat and preset games(Tic-tac-toe & Gomoku) Platforms: Windows, Mac, Linux

Go application for the iliad e-reader, can be used for linux/unix systems as well but keep in mind that it was designed for an embedded platform. Platforms: Mac, Linux