Comment by thePhytochemist

I made this spectrum analyzer/music visualizer recently. It's meant to be easy to use by just going to the URL and looks great on a 4K screen, jameskdouglas.github.io/frequenSee/

For some clients, electronics for a low impedance guitar pickup (pick up all the signal then process it later instead of building in filtering to the pickup).

And an automated design app that turns a 3D model from Fusion into something that's easy to change the parameters on. That way people can easily just type stuff in and move on to manufacturing. This started for staircases - for companies that make like 20 sets of wood staircases on site every day they want to turn that 1hr of drawing into 60s of data input.