Had lunch with Mark S. Miller and found out that A) the E capability-aware was built to implement a decentralized multiplayer game in the 90s and that B) *they built that game*! It was called Habitat: http://www.crockford.com/ec/
~"But in the 90s ideas about open source and how important it was weren't clear at the time and so many of those accomplishments died."
@cwebber I still remember the discussion I had in the mid-90s about what sort of license to use for things I was writing. Free Software was still a relatively unknown thing (Open Source was still to come) so it took a bit of, what is this thing and why should I use it?
I suspect there is lot of software from that era that the authors wish could be re-licenced, if only to see what others will build from it.
Octodon is a nice general purpose instance.