JOE is one of the most versatile TUI editors out there. It can emulate not only Wordstar, but Pico/nano, and Emacs. It has full UTF-8 support and can display pretty much any character in any written language.

These days I just use nano for simple, quick command line editing, but my writing machine (2000 era Dell Latitude CPx with Slackware) has JOE for long-form writing in Wordstar mode. Like the article author there's no need for internet or other distractions, just boot to terminal, log in, open JOE, and start writing on the fantastic keyboard.