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3blue1brown is great, e.g. his Fourier transform animation is super intuitive: https://youtube.com/watch?v=spUNpyF58BY

He has opensourced his animation engine "manim" used in his videos: https://github.com/3b1b/manim

Thank you for showing me that Fourier transform video. I've never understood how it worked because usually they just show the integral and call it good.

There are plenty of animations/videos about algorithms, all the way up to Hungarian folk dancing: https://youtube.com/user/AlgoRythmics/videos

I follow Tamás Görbe on Twitter and he regularly posts cool mathematical animations: https://twitter.com/TamasGorbe/status/1238448040521932801

This was very useful while learning stats: https://m.youtube.com/channel/UCtYLUTtgS3k1Fg4y5tAhLbw