WordPerfect was like vi: forbidding entry point, difficult key bindings, and a joy to use once you got it.
Word for Windows even had a mode that replicated the plain blue screen and behavior of WP5.1 for a few years, which I still miss.
WP also ran on the UNIX of the day, with look and feel very much like the DOS version. Tavis Ormandy got it working on Linux[0].
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