It may seem strange, but I’m actually very passionate about old word processing software. Here are some useful links I’ve amassed over the years; hopefully you can find what you’re looking for.
WordStar
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Robert J. Sawyer’s super useful WordStar 7 resource (including complete manual PDF scans!)
XyWrite
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XyWWWeb with resources for emulating with vDosPlus
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Lexitec’s XyWrite Utilities page, including XyWrite 4 manuals (Zip)
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XyWrite Made Easier by David H. Rothman (Archive.org)