The WWW VL: Educational Technology - Educational VR (MUD) sub-page (05-Jan-2000)https://tecfa.unige.ch/edu-comp/WWW-VL/eduVR-page.html
the wider spread MUD architectures MOOs are probably best suited because of the pretty powerful MOO programming language. MOO Tools for on-line classes & tutorial rooms : Buil
That's everything I could find.
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