We recently discovered this treasure trove of free Facial Blendshapes provided by the Institute for Creative Technology at USC.
This pack has over 150 facial blendshapes and is released under the MIT license. The pack will help you to create completely customizable characters with their amazing presets.
Mike Smith, a 3d and VFX Artist at ProductionCrate.com shows us how we can harness the power of this collection in this video.
Start by shrink-wrapping the generic neutral base mesh onto a custom head model. Apply the shrink-wrapped head as a blend-shape. Any unique character can be set up for a realistic facial performance with very little time or effort.