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Is spine a viable option for a 2D animation tool in Unity 2D
Program called Spine can be used as a 2D animation tool, It has bones, keyframes and everything same as a 3D animation tool, but it's paid.. Which might of put some, but It is great, only thing is.. Is it possible to use it in Unity 2D? I am not sure..
You can download the spine-unity runtime for evaluate purpose and see various examples with it:
spine-unity Runtime Documentation