These are mirrors for the official AnimateDiff v3 models released by guoyww on huggingface https://github.com/guoyww/animatediff/
An explaination of the improvements introduced with v3 can be found on this github https://github.com/guoyww/animatediff/#202312-animatediff-v3-and-sparsectrl
Some resources for starters
https://education.civitai.com/beginners-guide-to-animatediff/
https://education.civitai.com/new-animatediff-motion-modules/
In addition to that i can also recommend our Thursday's office hours with team member Tyler (jboogx.creative) which focus on creating animations with stable diffusion.
Alternate AnimateDiff v3 Adapter (FP16) for SD1.5 and Automatic1111 provided by the dev of the animatediff extension here. Thanks for pointing this out, 8f8281 :)