You can add https://ossia.io which (as its author) I believe is fairly unique in combining node-based and timeline directly in the same UI :)
Any particular reason for the player part to be LGPL rather than something more permissive? Don't see the player portions being badly appropriated or fork-extended commercially w/o the main tool that definetly should remain GPL:ed. (I'm still active in the demoscene doing 64k's where exe-compression usually works with single exe's)
And the player is what actually contains most of the interesting algorithmic "meat" ; a company could build a custom DAW on top of it without much trouble for instance.
Though from experience with my own tools, I suspect that in the end the UI code for the tool will outweight most other parts in the end.