user interface questions

I noticed TinyGL mentioned on the Plan 9 TODO list at
https://plan9.io/wiki/plan9/TODO/index.html  Was wondering what kind
of development was in the works for this before it stalled.  I'm
currently doing some work on a TinyGL fork myself and was wondering if
there was an interest in sharing resources.

Also wondering what user interfaces are typically used with Plan 9
programs (programs not designed for the command line).  Is there
anything on the roadmap for user interface development?  I've looked
at several GUI and TUI libraries on a variety of operating systems
(over a long period of time) and I've yet to find one I really like.
I do like working with command line programs, but some programs just
don't lend themselves to that format.  Was wondering what design ideas
Plan 9 developers might have for user interface development.

Thanks.