The latest version of Carl Sassenrath’s REBOL language has been published as open source, marking a major change in how the novel language is made available to the public. REBOL, a previously proprietary language developed by Sassenrath, the primary developer of AmigaOS, was first released in 1997 and is oriented towards task-specific language dialects or domain-specific languages to be used in processing. It has a number of “dialects” for purposes such as data exchange (load), programming (do), pattern matching (parse), function and object definition (make), and GUIs (layout or display). These dialects work together with a free-form syntax to provide an intriguing language, but one which has never become mainstream.