This is a good place to post your notes and documents about Rebol 2 and Rebol 3: guides, ideas, features, or changes. Everybody can contribute.
Visit http://www.rebol.com/download-view.html and download your version.
Rebol 2 guide in Japanese is here: http://www.rebol.net/wiki/Index_of_Japanese_Documents An introduction of Rebol in italian is here: http://www.maxvessi.net/pmwiki/pmwiki.php?n=Main.GuidaARebol
You can download Rebol3 ready to use from http://rebolsource.net/ . If you don't find you platform or you need to optimize rebol for your platform, you can build it from source.
Rebol for Android can be found here: http://development.saphirion.com/experimental/