2 Minute Acid with Strudel
A colleague reminded me of this:
Strudel is very much like Supercollider / Sonic Pi, but as a (Haskel and) Javascript library that can do live editing in the browser.
They also have a tutorial .
What I like about this are the built-in sliders / visualizers. Connecting this to MIDI inputs for live performances could also be fun, if I was doing live performances or performances at all.