I Want to be an Animator is a Youtube collection of free Lessons, Tutorials and Tips about 3D Animation, mostly focusing on the basics and principles.
GreenScreen Animals is an extensive library of domestic and exotic animals video footage in high definition.
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!
AnimLvlUp is a facebook page hosted by animator, Jason Shum that has a bunch of great videos and interviews with industry veterans that share their stories of getting into the animation / games industry.
Darkstalkers – 12 Principles is an article that explains the 12 principles of animation through the pixel animation of Darkstalkers
Storyboarder is a free open-source piece of storyboarding software that makes it easy to visualize a story as fast you can draw stick figures.
Riot Creative Contest 2017 is a competition by Riot Games and hosted by Polycount that artists, animators and other disciplines can enter. Expect killer prizes, amazing art, and stiff competition.