Sakugabooru is a huge animation archive used by fans and animators alike to upload and view animation clips from anime movies and shows.
Drawn to Life is a two volume collection of the legendary lectures from long-time Disney animator Walt Stanchfield. For over twenty years, Walt helped breathe life into the new golden age of animation with these teachings at the Walt Disney Animation Studios.
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.
The Smearframe Slack channel is an animation chat group where you can talk about anything from inspiration, tips, rigs and more. Get an invite from the link above and join the fun!
Cartoon Network D.O.C is an amazing site for viewing storyboards, model sheets, backgrounds and more from cartoon network shows.
Iamag.co is a huge collection of references for walk cycles. The collection contains illustrations, sketches, model sheets and tutorials…
Brendan Body has a great post on his website which displays lots of great reference and observations on birds and flight.
Living Lines Library is an amazing resource full of pencil tests, drawings, documentaries and more from the animation legends!
LOLking is a website that can be used to view League of Legends characters and their animation sets. Great as a source of game animation reference!