Desktop/Android/HTML5/iOS Java game development framework
Extensible Line-drawing & Polygon-filling Rasterization Libs for Java
Minecraft Forge Hybrid server implementing the Spigot
Built to be ease of use, with no programming knowledge, Multi-platform
UtiliGame is a light-weight game engine written in Java.
AdventureMap peripherals for ComputerCraft
A 2D Java game engine