Elementary Audio I already explained. But it is the brainchild of Nick Thompson. He started this about 3 years ago. Prior, he had built some tooling to allow you to create the UI for music instruments and plugins via JUCE in React, which I thought was a pretty cool approach. He has a project using Elementary Audio and JUCE and his previous approach to using web technologies to build native AU and VST music plugins.
https://www.elementary.audio/https://github.com/elemaudio/srvb (project described abovespecific playground link If this sounds like jibberish, it is specialized software for creating instruments and effects for music production. Usually a very complicated c++ affair.