Downloads LeJOS

Win32 leJOS
Download version 2.1.0
Download API docs
View Win32 Installation Notes
Linux/OSX/Solaris leJOS
Download version 2.1.0
Download API docs
View Unix Install Notes
Download Area at Sourceforge
Other releases, notes, dates and sizes are available at the SourceForge download area.
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 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 for Eclipse IDE

leJOS 3 for the RCX (release candidate)

leJOS 3 will be the final release for the RCX, incorporating all the enhancements to lejOS made since the 2.1.0 release in 2003.

Release Candidate 2 (17th of September, 2006):

assemblied by Matthias Paul Scholz

Disclaimer: Java is a trademark of Sun Microsystems. Lego Mindstorms is a trademark of the LEGO Group. There is no association between Lego and leJOS or Sun and leJOS, or even between Lego and Sun as far as we know.

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