vetetris is a game written in Java. It's similar to tetris, but it is played in 3D. There are figures which are falling that have to be placed in the right manner. You can rotate the blocks in six different directions and move them in five directions. As time goes on they move faster and faster, and it gets harder to put them in the right spot.
Superficially, Dominoes on Acid is a solitaire variant of Dominoes with weird colorful tiles (and this view is enough to play the game). But on a deeper level it is a GUI for natural deduction. Every completed domino is equivalent to a proof of a tautology in classical propositional logic. The game can be played online as an applet or offline as an application. It is built on a simple isometric engine that can be used independent of the game.
Jetrix is a TetriNET server designed for maximum scalability, extensibility, and ease of use. It features a Web-based administration console and a simple API to let developers add custom commands or change the channels' behavior with little knowledge of the server's inner functioning. The ambitious goal of this project is to create the ideal platform for TetriNET programmers.
Fox Hunt is a logic game written in Java. It was inspired by the sports competition of the same name. In that competition, participants run in the forest equipped with small radio locators, seeking small hidden radio wave emitters called "foxes". In Fox Hunt you are one of such participants armed with advanced locator which can scan full horizontal, vertical, and both diagonal directions and report the number of foxes "visible" at all these directions.
jTans is a Java version of Tangram, an ancient Chinese puzzle. The object is to put 7 geometric shapes together to form a given outline. All of the pieces must be used and are laid next to one another. It can be run as a Java 2 applet, a standalone application, or a Web Start application.