Codename Alpha will (when finished) be a realtime strategy game (RTS), written entirely in Java.
For now, it is a Java RTS engine with a small testgame (including one kill-all mission).
AI uses an integrated trampoline-style cps-interpreter for scheme.
several vaguely related projects worked on by me: a 3d engine with a javascript-like scripting language (pdsys); an older scheme dialect (vmsys); ... (2009-04-28: I have been gone for years, may try to put up some newer stuff...).
Formicidae is the official simulator and visualizer for the Ant-Wars competitive programming site, written in Java and SISC. The site is hosted at www.ant-wars.net.