More recently, Unreal Engine's Blueprints too (and UE's Kismet before that). 3D modelling tools and texturing tools also often use visual languages for shaders,

More recently, Unreal Engine's Blueprints too (and UE's Kismet before that). 3D modelling tools and texturing tools also often use visual languages for shaders, and, as you've mentioned, in audio its also relatively common. Lustre/SCADE is my favourite example though (and is used in a lot more than just avionics too, according to the ANSYS marketing material: transportation, energy, etc)