I am a big fan of Underware’s work in the handwriting realm. www.scribomat.com
What are some of your favorites? Curious to see how far the boundaries have been pushed 
Yeah those are incredible!
I put vertical/horizontal stress, width and crossbar height axes in Jetlab:
or https://fonts.adobe.com/fonts/jetlab-variable
And spent way longer than could ever be justified getting the 3D extrusion to rotate in Deadline Open:
Useable or not? Look forward to hearing your thoughts…
john