treehouse
  1. The one built into devtools
  2. Easing Wizard to design curves while floating through space. Lot of customization controls. Also a great launch post where he filmed the trailer with his phone filming the page on an ipad in the dark.
  3. easing.dev for x1/x2/y1/y2. Includes an easter egg
  4. Nice simple one https://www.kvin.me/css-springs

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