This is a paid asset, but now you can download Puppet2D Free.
Detail this asset from Unity Asset Store: Original Link
Puppet2D v3.8 (Latest version)
“If possible, please buy the package to support the developer”
Puppet2D is an advanced 2D Skeletal Animation Tool.
– AUTORIG – Rig it in a minute! Makes rigging a biped really fast.
– Add ready-made animations onto your AUTORIG – they work on any shaped biped! (Idle & walk animation included).
– NEW Blend Shapes
– FFD (Free Form Deformation)
– NEW Voxel based skinning
– Spline Controls for tails, tentacles and bendy things
– 2D Rigging – Create easy to use Controls, that makes animating much easier
– Rendering with Alpha
– Parent & Orient Controls
– Quick Sprite To Mesh Conversion – Weight Painting
– Pose Saving & Loading
– Bake Control Animations Onto Bones
– Sprite Management by converting to Mesh for Skinning, or easy parenting of Sprites to Bones