Regina REXX 3.9.6 is available for the OS/2, ArcaOS and eComStation platform. (2022/06/25) .
https://sourceforge.net/projects/regina-rexx/files/regina-rexx/3.9.6/Regina396os2.zip/download
"Regina is a Rexx interpreter that has been ported to most Unix platforms (Linux, FreeBSD, Solaris, AIX, HP-UX, etc.) and also to OS/2, eCS, DOS, Windows/2k/XP/Vista/7/8/8.1, Amiga, AROS, QNX4.x, QNX6.x, BeOS, MacOS X, EPOC32, AtheOS, OpenVMS, SkyOS and OpenEdition. Rexx is a programming language that was designed to be easy to use for inexperienced programmers yet powerful enough for experienced users. It is also a language ideally suited as a macro language for other applications."
Project URL: http://regina-rexx.sourceforge.net/
Source: eCSoft/2