My favourite was Protext (Arnor) which was an old school mostly keyboard-centric word processor, rather than anything like DTP. Crazy powerful. It was originally Amstrad CPC, but later released on Atari ST, MS-DOS, Amiga, Archimedes and even more bespoke hardware like the Amstrad NC.
Did you know Protext is freeware now?
https://www.aptanet.org/protext/
I do a bootable DOS system on a live USB key and it includes Protext. :-)
https://github.com/lproven/usb-dos