Animation Mentor Rigs – Two free rigs from Animation Mentor when
Animation Mentor Rigs (FREE)
Dota 2 Rigs (FREE)
Dota 2 Rigs – A large selection of free Dota 2 rigs on the Steam Workshop
World Zombination Rigs (FREE)
World Zombination Rigs – A free set of rigs from the game ‘World Zombination’ for use with Maya
Kiel Figgins Rigs (FREE+)
Kiel Figgins Rigs – An amazing selection of free and paid rigs (mostly paid) are available on Kiel Figgins’ website.
Truong Rigs (FREE+)
Truong Rigs – A massive selection of free and paid rigs all made by Truong
BodyMech Rigs ($40)
BodyMech Rigs are a series of Maya rigs, designed to be perfect for honing in on those body mechanics and body acting skills.
Animator's Resource Kit 