Getting this back onto topic & lifting the page on this that I wrote for the UK VM Users Group last year, I found uni-SPF and SPF/UX, of which SPF/UX said they had a linux for S/390 version.
I don't know whether these are any good since I agree with Melinda's assesment of ISPF. THE has recently received an ISPF compatibility mode. How good the compatibility is is another matter, however it may be good enough for you. (http://www.macro4.com/vmug/archive.html) Rod
