For whomever may find this of interest -- the Object Icon project,
mentioned on this list in passing in August 2018, also caters to Plan
9:

The Object Icon object-oriented programming language:
http://objecticon.sourceforge.net/

Of wider use may be its version of drawterm
http://objecticon.sourceforge.net/Drawterm.html
and its (much) modified rio
http://objecticon.sourceforge.net/Riox.html

Mark.

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