JGame is a 2D game engine that makes multi-platform development easier. It runs on the Java JRE 1.3+ platform with optional OpenGL (JOGL) enhancements, the J2ME (MIDP2.0/CLDC1.1) mobile platform, and the Android (2.1+) platform. JGame features sprites with automatic animation and collision detection, a tile-based background with easy sprite-tile interaction facilities, automatic scaling, sound, game state, persistent storage, and game options. The engine provides an enhanced graphics API with a fallback to simpler and more efficient graphics on J2ME and plain JRE. A patched version of the JBox2D physics engine that runs on all platforms is included.
Guitar Trainer is an application for mobile devices that helps musicians learn the fretboard of their stringed instrument thoroughly. It supports guitar, bass, banjo, ukulele, mandolin, and cavaquinho (in standard and alternate tunings). It includes a training mode, a game mode, and a tuner. It should work on any Java device supporting CLDC 1.1/MIDP 2.0.
Fountain 3D is a little J2ME toy and a technology demo for a custom-made 3D wireframe engine with some benchmarking abilities thrown in. The camera is fully controllable by the user together with the simple particle simulation. The software doesn't require hardware acceleration; all J2ME compliant mobiles are supported.