Hi and welcome to the forum!
If i may add to the answers given, you might want to edit the title of this topic. To something like: Modules for light/oscilloscope drawing?
It might help getting answers from others who already discussed this topic several times, either here on the forum or on FB.
Right now the title suggest you are looking for another program that is equivalent to VCV Rack 
In addition to what you are looking for, are you familiar with OsciStudio? It is very interesting for rendering wav files of drawing designs that can be used as source, triggered from sample players.
Another alternative if you can’t get satisfied with Rack modules, there are a set of interesting VST plugins by soundemote.com
But you will need VCV Host module for that, and i have checked only the Spiral plugin which worked.
I do remember sending them a mail asking if they were interested in developing the VST’s as modules for Rack.
You could try sending soundemote.com a mail requesting the same 
