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.
Johan The Dog is a free quadruped rig for Maya for use in non-commercial projects.
Grey Matter Gary is a free Maya rig from Squiggly Rigs
The AZRI Rig is a simple animation rig for Maya 2018 and above, representative of video game projects aimed at retaining a high frame rate when working even on lower-end machines. Featured in the book, ‘Game Anim’
Red Dragon Rig is a free Maya rig made by junior rigger, Elise Mathez
Challenger Jacobus is a Youtube playlist made by Eric Jacobus where he performs movesets from beat-em-up games in real life. Great resource for animation reference!
GreenScreen Animals is an extensive library of domestic and exotic animals video footage in high definition.
AnimSelector is a free and super simple Maya script that allows you to quickly setup selection groups that you can later pickup from a GUI or assign to hotkeys.
Fantasy Crocodile Rig is a free Maya rig that has a super appealing design.