The WordPerfect editor has been ported from an earlier Linux version to an up to date version: https://github.com/taviso/wpunix
I was a fast enough typist that I had a little extra time to play with WordPerfect every now and then. I found its macro system and learned it. Then I wrote macros to format a bunch of raw text. Then my workflow was like typing handwritten inputs into the start of a WP doc, pressing a couple keys, then printing the results.
Our goal was to do something like 20 forms per day each. After I shared my macros with my coworkers, we could easily do that many per hour.
My boss told me to STFU and not go crazy with the productivity gains. Turns out I turned all sorts of things in that job, many involving office politics.
It’s not a clone, but you can run actual WordPerfect on Linux and Windows with a little effort…
http://download.microsoft.com/download/word97win/Wd55_be/97/...
I was sorry to move off of WP5.1 for DOS when Windows became "the standard"; WP for Windows just wasn't the same, nor was Microsoft Word for Windows (which we switched to in any case because that's what clients were all using). The WP5.1 macro facility was very nice; among other things, I'd used it to write a simple Emacs keystroke emulator, which speeded up my writing quite a bit.