A community fork of 3Brown1Blue's [0] Manim [1] for creating the math animations and pictures used in their videos. From the manimcommunity's README:
"""
NOTE: This repository is maintained by the Manim Community and is not associated with Grant Sanderson or 3Blue1Brown in any way (although we are definitely indebted to him for providing his work to the world). If you would like to study how Grant makes his videos, head over to his repository (3b1b/manim). This fork is updated more frequently than his, and it's recommended to use this fork if you'd like to use Manim for your own projects.
"""
""" NOTE: This repository is maintained by the Manim Community and is not associated with Grant Sanderson or 3Blue1Brown in any way (although we are definitely indebted to him for providing his work to the world). If you would like to study how Grant makes his videos, head over to his repository (3b1b/manim). This fork is updated more frequently than his, and it's recommended to use this fork if you'd like to use Manim for your own projects. """
See the gallery for it in action [2].
[0] https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw
[1] https://github.com/3b1b/manim
[2] https://docs.manim.community/en/stable/examples.html