elements

There's a relatively new C++ GUI library literally called "Elements". Not sure how it works though, but the way it looks, and the music background of its creator makes it appear that DAW applications might have at least been considered. https://github.com/cycfi/elements Edit: It does mention VST and AU in the introduction: > "It should not own the event loop and should be able to co-exist with components within a plugin host such as VST and AU."