I've been funding CSS Grid implementation work for 2+ years so that eventually no one needs a framework for grid layout. Go play with it in Chrome and help squash bugs :)

Riot 2.0 is a "core" library and such controls can be build on top of it. No controls exist, since this is all very new.

I would say that a grid would be a great showcase, especially with custom column renderers and/or editors. That's a real stress test for any GUI system, update code, templating etc.

What happened to Riot 1.0 though?

Riot 1.0 started liking what React did to views.