Animation Comparisons is a YouTube playlist that includes videos showing how various animations look in multiple different games. Great for reference.
Smart Layer
Smart Layer is a script for Autodesk Maya that allows you to adjust animation using layers in a much easier and more powerful way.
Mecha-Mechs Rigs
Mecha-Mechs Rigs are a free sample of a larger set of Maya rigs from fRigging Awesome Studios
IK/FK Switcher
IK/FK Switcher is a free Maya tool that allows you to build a temporary IK/FK setup on top of your original controls, while preserving animation.
VGAR
Video Game Animation References is a YouTube channel focused on sharing various types of animation reference from video games (Idles, attacks, movement.. etc)
50 Ways To..
50 Ways To.. is a series of videos by Kevin Parry showing how much variation there is in the simplest thing. A fun and extremely useful resource for animators looking for inspiration
She-Hulk Rig
She-Hulk Rig is a free Maya rig made by @CromaCore_. Download it from his Gumroad page!
Kratos Rig
Kratos Rig is a free Maya rig made by @CromaCore_. Download it from his Gumroad page!