Regina is also a
portable Rexx interpreter, that (as of writing) runs on "most
Unix platforms and also to
OS/2,
DOS,
Win95/98/NT,
Amiga,
QNX,
BeOS,
OpenVMS and
OpenEdition.
(Amiga and OS/2 are known to run Rexx without funky interpreters, though =)
Home page: http://www.lightlink.com/hessling/Regina/