Rexx study generally begins with http://www.rexxla.org

CL keeps a few pointers [1]. Howard Fosdick nicely profiled [2] its significance in the world of open source as of mid-2005, in light of IBM's release [3] of Object Rexx.

Howard Fosdick profile is now at

http://web.archive.org/web/20050830062010/http://programming.newsforge.com/programming/05/06/21/154227.shtml

A Tk binding for Rexx can be found at: http://rexxtk.sourceforge.net There have been others ...; this might be the most lively, as of 2004.

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