REXX/imc is a Rexx interpreter for Unix. It supports all the standard
instructions and built-in functions, plus a small number of extensions,
and has a partial implementation of the SAA API allowing applications
to call Rexx programs and to register addressing environments, Rexx
functions, and exit handlers.

WWW: http://www.cs.ox.ac.uk/people/ian.collier/Rexx/rexximc.html