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There’s also https://reanimate.github.io/, which is the same thing for Haskell.

3B1B is incredible. I loved his video (https://www.youtube.com/watch?v=r6sGWTCMz2k) using Fourier series to make epicycle animations. I worked through the details to make my own: https://bldavies.com/blog/computing-epicycles/

How is this different than Brilliant?

Both great tools, but for different applications.

Brilliant is an education platform. Manim is an animation tool.

Manim animations could be used for education, but I do not believe Brilliant can be used to create custom animations.

Free and open source