Manim is an engine for precise programatic animations, designed for creating explanatory math videos. It was originally created by the YouTuber 3Blue1Brown.
I have created various videos and illustrations using the software, including one video of a graphical derivation of the Yield Curve from economics, which I posted on Reddit: https://www.reddit.com/r/3Blue1Brown/comments/n5cn0j/yo_i_made_a_quick_video_in_manim_showing_a/gx4ifp7/?context=3.