See also Ometa:

http://tinlizzie.org/ometa-js/

https://en.wikipedia.org/wiki/OMeta

https://github.com/alexwarth/ometa-js

And Cola:

https://en.wikipedia.org/wiki/COLA_(software_architecture)

Some more links on the WP page for VPRI: https://en.wikipedia.org/wiki/Viewpoints_Research_Institute

And VPRI's own wiki:

http://www.vpri.org/vp_wiki/index.php?title=Main_Page

As far as I've been able to gather, the most immediately useful stuff, is the ideas and concepts in OMeta, as well as the various implementations of OMeta.

Ometa is amazing. Ohm, the successor is even better.

I believe that's: https://github.com/cdglabs/ohm ? I see I've starred it at some point, but can't remember really looking at it. But if it's a refined/improved OMeta, it would indeed be interesting. Thanks for the reminder.

That's the one.