I’m planning a course on electronic music techniques (both synthesis and composition) and am very tempted to use the WIP web version of supercollider. Imagine not having to install anything, just open your browser and start exploring. But it’s probably a bit too early and I’m not sure if it’s even possible to run as a library and use custom HTML interfaces yet. The pragmatic alternative is to use M4L (the students already have Ableton installed). I’ll give scweb a try though.

Another option -- Cardinal in the browser: https://cardinal.kx.studio/live.

It's essentially VCV rack but with a very large selection of modules pre-installed.