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.
Quickposes is a tool for art students, illustrators or anyone who wants to focus on improving their drawing skills. By practicing gesture drawing you will not only get better at recognizing certain aspects of poses, but you will also build a visual library of characters and models.
Living Lines Library is an amazing resource full of pencil tests, drawings, documentaries and more from the animation legends!
Posemaniacs is good free resource for searching for specific poses at various angles. It has 1000s of poses displayed by male and female 3D models.
Line of Action is a really useful site for learning about the human form, anatomy, speed drawing and more. Useful for both 3D and traditional animators!
Wowhead is a site that allows you to view character animations from World of Warcraft. Another great source for game animation.
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!