Even though I was barely ever a WordStar user, the existence of WordTsar—a cross-platform open source WordStar 7 clone for Windows, Mac, and Linux—makes me happy: http://wordtsar.ca/

@cstross it also seems able to recover / convert some quite early WordStar documents.

LibreOffice had (has?) support for a whole bunch of legacy formats but WordStar was never one of them.