Grease Pencil Rigs are a free set of basic rigs for Blender 2.8 that are for use with Grease Pencil. They are aimed to ease the drawing of characters by showing construction lines which you can use for reference while drawing.
AnimChallenge is a Facebook group that features a monthly animation challenge as well as a dedication to learning within the animation community.
Johan The Dog is a free quadruped rig for Maya for use in non-commercial projects.
Advanced Skeleton has been used to rig creatures, props, vehicles and just about anything since 1999. It is free to download but if you want to use it for a commercial project you will have to buy a license.
The Animation Streamers List was compiled by David J Pumpa and features a bunch of great animation streamers on Twitch.
Animation Exchange happened again! If you missed the live twitch stream you can catch up using the link above!
Grey Matter Gary is a free Maya rig from Squiggly Rigs