Red Dragon Rig is a free Maya rig made by junior rigger, Elise Mathez
Fantasy Crocodile Rig is a free Maya rig that has a super appealing design.
Rocket Girl Rig is a free Maya rig from the VMComix animation blog.
Jasmine Rig is a free rig for Maya that has a load of great features!
Tri Vital has created a collection of awesome Maya rigs and put them on gumroad for free!
The External World Rigs are a free set of rigs for 65 characters created by David O’Reilly
The Hekaton Rig is a free Maya rig available on gumroad from Luis Perez and Tre Vital
The Mery Rig is a Free Rig project by José Manuel García Alvarez and Antonio Méndez Lora and works with Maya 2013+
The Judy Hopps rig is a free Maya rig based on the character from ‘Zootopia’