Animation Methods is a website hosted by animator David Rodriquez and has links to hundreds of rigs, tools and tutorials.
Frame by Frame provides educational breakdowns of animated and live action clips for animators looking to learn and non-animators who just can’t get enough of the artform
AnimChallenge is a Facebook group that features a monthly animation challenge as well as a dedication to learning within the animation community.
The AniMates are a professional group of animators who get together every Sunday on Twitch to interview other animators, discuss animation topics and work on personal projects live! Their aim is to create a community of content to help both experienced and beginner animators! They also post everything to their Website
The Animstate Discord is a great place to meet and chat with some friendly animators. Whether you are looking for veterans or students, this is the place to be!
Cartrdge is a portfolio community for creatives working in video games and is great for creating a page and uploading animations in multiple formats such as Vimeo, Youtube, Gif.. etc
Thinking Animation has a great section on the pros and cons of different rigs. As well as a bunch of other resources and tips across the site.
Newgrounds is a popular website for posting animations, games and audio and has been around for over 20 years. Founded by Tom Fulp (also founder of The Behemoth [game developer])
Animators Resource is a similar website to this one but focuses more on specific posts and videos rather than linking to other websites.