eXist-db is a feature rich Open Source native XML database
Pequeño IDE para el lenguaje JMEScript.
IDLE Extensions
A Java VM for ARDUINO and other micros using the leJOS runtime.
A cross-platform interpreter for many point-and-click adventure games
Simulation tool for the casino game Roulette
Computer calculations made easy
A Logo interpreter and programming environment specialized for schools
Graph algorithms interpreter, IDE, debugger, 3D visualizations.