You mentioning visual languages makes me think of DRAKON, which was good enough for the Russian copy of the space shuttle project: https://en.wikipedia.org/wiki/DRAKON
I don't know of many visual programming languages like this that have production uses. I've seen things like node based editing in Quartz Composer, various game engines, 3D modelling software, etc, but it's almost always only really for pipelines of graphical values rather than truly general purpose programming (even if they might be Turing complete).