Free interpreter for Unix, MSDOS, WinCE and Amiga. By Vassilis N. Vlachoudis.

Dialect used in KEDIT (XEDIT-like editor). Summary by Rex Swain.

Classic Rexx language interpreter for Windows, from Kilowatt Software.

Writing portable Rexx execs. By Dave Alcock.

ANSI standard implementation for UNIX systems. Free sample code library.