The Ray Rig is a free Maya rig useful for dialogue scenes and performance offered by CGTarian
Ray Rig (FREE)
Judy Hopps Rig (Blender)
The Judy Hopps Rig is a free rig for Blender based on the character from ‘Zootopia’
Morpheus Rig v1.0 (FREE)
The Morpheus Rig is a free Maya rig created by Josh Burton available to download from his personal website
Minion Rig (FREE)
The Minion Rig is a free Maya rig based on the popular Minion characters from ‘Despicable Me’
Pink Panther Rig (FREE)
The Pink Panther Rig is a free character rig for Maya based on the popular character ‘Pink Panther’
Tiger Rig (FREE)
The Tiger Rig is a free rig compatible with Maya 2015+
Animator's Resource Kit 