GeckoLib is an animation engine for Minecraft mods, with support for complex 3D keyframe-based animations, numerous easings, concurrent animation support, sound and particle keyframes, event keyframes, math-based animations, and more. Available for all major modloaders.
geckolib-neoforge-1.21.1-4.6.6 crashed neoforge 21.1.61 with no other mods installed https://pastebin.com/raw/XzKcguYD