The Animation Streamers List was compiled by David J Pumpa and features a bunch of great animation streamers on Twitch.
Anim Streamers List
Storyboarder
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.
Dragonframe
Dragonframe is the stop motion animation software that captured Laika’s ParaNorman, The BoxTrolls and Disney’s Frankenweenie. Free Trial available.
Frame by Frame (Blog)
Frame by Frame is a blog that displays sequential images from various animated films for study and appreciation. It also shows the gif to supply reference for timing.
OpenToonz (FREE)
OpenToonz is a free open-source software for producing 2D animation and is known for being used by Studio Ghibli
Source Filmmaker (FREE)
Source Filmmaker is a free movie-making tool built and used by Valve to make movies inside the Source game engine. It is a full package and can be used to make cinematics using Valve models and environments.
Animator Island
Animator Island is a treasure trove of animation secrets, techniques, tips, and information on your quest to become a Master Animator
On Animation
On Animation is a website filled with animation analysis, behind the scenes, podcasts and more. Check it out!
Animator's Resource Kit 