Detail this asset from Unity Asset Store: Original Link
This is a paid asset, but now you can download Puppet3D Free.
Puppet3D v1.9 (Latest version)
Puppet3D is a professional rigging toolset for Unity.
– AUTORIG – Rig it in a minute! Makes rigging a biped really fast.
– Create bones and skin them to any character or asset.
– IK & FK – Make IK controls for the limbs, which can blend between IK and FK.
Create a “Mod-Rig” on a humanoid in 1 click, to modify or make new animations.
– Advanced Rigging – Spline Controls for tails and bendy things, Parent, Orient, IK and Global controls.
– Paint the Skin Weights.
– Voxel based default skin weights. Spreads the weights through the characters volume.
– Pose Saving & Loading
– Bake Control Animations Onto Bones