Alexander Perrin - Has a passion for meticulous dynamics, detailed digital rendering techniques and cats.
Manim - Mathematical Animation Engine made by Grant Sanderson. (HN) (Manim Community) (Community Fork) (Manim.js)
Loom - Hand drawn animation tool on iPad.
React-spring visualizer - Missing visualizer for your react-spring UI animations.
Awesome Web Animation - Most useful tools and data for creating web animations.
Pose - Simple web app for character posing.
Lottie - Parses Adobe After Effects animations exported as json with Bodymovin and renders them natively on mobile and on the web. (Code) (Lottie for iOS, macOS)
WeightShift - Maya plugin for animator friendly, physically-based character animation.
FlowBetween - Tool for creating animations. (Web)
Pencil2D Animation - Easy, intuitive tool to make 2D hand-drawn animations. (Web)