BREXX BREXX: Free interpreter for Unix, MSDOS, WinCE and Amiga. By Vassilis N. Vlachoudis. (Interpreters) http://ftp.gwdg.de/pub/languages/rexx/brexx/html/rx.html
Rexx Anywhere Rexx Anywhere: Writing portable Rexx execs. By Dave Alcock. (Interpreters) http://www.planetmvs.com/rexxanywhere/
Jaxo: Rexx for Palm OS Jaxo: Rexx for Palm OS: Product description, including downloads and free runtime. (Interpreters) http://www.jaxo.com/rexx/
SAL SAL: Scientific Applications on Linux - REXX entry (Interpreters) http://sal.duth.gr/F/1/REXX.html
CICS Rexx CICS Rexx: Language and development environment. (Interpreters) http://www-3.ibm.com/software/ts/cics/products/rexx/
KEXX KEXX: Dialect used in KEDIT (XEDIT-like editor). Summary by Rex Swain. (Interpreters) http://www.rexswain.com/kedit.html
BeBRexx BeBRexx: BeOS port of BREXX. (Interpreters) http://www.bebits.com/search?search=rexx
Shadow/REXX Shadow/REXX: Dialect used in NEON System's Shadow OS/390 Web Server. Described in "Programming Guide". [PDF] (Interpreters) http://www.neonsys.com/downloads/documentation/Shadow_Web_Server/Shadow%20Web%20Server%20Programming%20Guide%20v48.pdf
REXX/VSE REXX/VSE: Product page, including support information and samples. (Interpreters) http://www-1.ibm.com/servers/eserver/zseries/os/vse/support/rexx/rexxhome.html