LDT- leJOS Development Toolset
This eclipse plug-in allows you to develop java code for the LEGO RCX brick using the leJOS JVM (please see http://www.lejos.org). It offers easy configuration through a project wizard and a preference page, uses eclipse code building and adds RCX specific operations both for firmware and byte-code download. Eclipse 2 and 3 are supported.
Download plugin here:Download
For more detail information.