Animation Paper is a popular free software for hand-drawn animation created by Niels Krogh Mortensen
Animation Paper (FREE)
Eadweard Muybridge
Eadweard Muybridge was known for his photography of humans and animals in motion, a lot of which can be found on google and is a great resource for reference material
Framepool (FREE+)
Framepool is a footage collection run by filmmakers and has a huge array of stock footage useful as reference material. It can be previewed for free or a higher quality version can be bought.
GettyImages (FREE+)
GettyImages has a massive selection of stock footage and is an amazing resource for reference material. Previews can be watched for free or you can pay for a higher quality version.
Extra Play
Extra Play focuses on analyzing video game animation and has over 40 videos that do just that! You can also follow Daniel Floyd on Twitter for more goodness.
Pinterest – Animation
Pinterest is a great place for animation inspiration and reference material. Whether you search for animation, dynamic poses or facial expressions you’ll always find something useful.
Howard Wimshurst Tutorials
Howard Wimshurst has a youtube channel filled with some great animation techniques that apply across both 2D and 3D disciplines.
GDC Tricks of the Trade 2017
GDC Tricks of the Trade 2017 is another great talk full of industry veterans giving away free animation tips.
GDC Tricks of the Trade 2016
GDC Tricks of the Trade 2016 has some amazing tips from industry veterans. If you haven’t seen this already you need to watch it right now!
Animator's Resource Kit 