nxtOSEK is an RTOS for LEGO Mindstorms NXT. nxtOSEK consists of I/O driver part of LEJOS NXJ, TOPPERS/ATK1 RTOS, and glue code for them. You can write applications for NXT in ANSI-C/C++. Check nxtOSEK site: http://lejos-osek.sourceforge.net
A really low footprint (< 10 Kb) Java VM and replacement firmware for the Lego Mindstorms RCX microcontroller, which is part of Lego's Robotics Invention System. TinyVM is the progenitor of <a href="http://lejos.sourceforge.net">leJOS</a>.
BrickOS is an alternative software environment for the LEGO(r) Mindstorms Robotic Invention System. The intent is to allow developers to write C and/or C++ code for the RIS platform.
leJOSUnit is a port of the Java based JUnit framework for testing robotic programs with a very small footprint. leJOS is a Java based replacement firmware (OS) for the LEGO Mindstorms RCX brick that comes with Lego\'s Robotics Invention System.
legOS is an alternative software environment for the Lego Mindstorms Robotic Invention System. The intent is to allow developers to write C and/or C++ code for the RIS platform.