https://github.com/initialcommit-com/git-sim uses https://docs.manim.community/en/stable/index.html of 3b1b fame.
https://pythonbytes.fm/episodes/show/321/a-memorial-to-apps-past talked about git-sim
https://motion-canvas.github.io/ is talked about in https://youtu.be/H5GETOP7ivs