Java based OS for Lego Mindstorms RCX. [Open Source]

PocketPC and Palm Java Virtual Machine.

Very small Java VM, and firmware replacement for Lego Mindstorms RCX. Progenitor of leJOS. [Open Source, MPL]

Implementation of the Java VM as soft processor core in an FPGA for embedded real-time systems. [Free for personal use or for educational purpose]

Small Java virtual machine aimed at portable devices, but also runnable on desktop computers. [Open source, GPL]

Specializes in Java virtual machine and compilation technologies for the embedded device communities.

Virtual machine and development tools for embedded platforms, including static linking and native compiling, and a real-time garbage collector. [Commercial]

Provide custom solutions for embedded Java with their Lightfoot technology.

A Java platform optimized for measurement, control and automation applications. The JControl Virtual Machine's design is as lean as it runs even on 8-bit microprocessors and hence it can compete with common 8-bit-systems.

Instructions for compiling Java programs on EPOC.