New Frame Plus is a Youtube channel dedicated to analyzing video game animation hosted by Daniel Floyd
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.
The Fighters Generation is a world renowned character database… featuring just about every fighting game character in existence. It boasts an unparalleled collection of the best quality artwork, pictures & animations!
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])
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 is a treasure trove of animation secrets, techniques, tips, and information on your quest to become a Master Animator
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!
Zweifuss is a website that displays the sprite animations for Street Fighter 3 – Third Strike. Great for reference material and for just admiring the lovely sprite animations.