Maker of Framer (http://framer.com) here. Cool to see this popping up on HN. We are a code based interactive design tool, and see many designers use/learn code to experiment with math, real data and physics.
PS. I recently rewrote Cactus as a Gulp script. It's called Moonbase: https://github.com/motif/moonbase
I ask this because it seems that Framer was previously called FramerJS but the code looks like Python.