Download Animancer Pro FREE Unity.
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Animancer allows you to play animations on-demand and control all their details without any additional setup steps. It solves the major problems with Animator Controllers and can either replace them entirely or work alongside them. This makes animations much easier to work with in all stages of development from basic prototyping through to maintaining and debugging complex systems.
You can try out all the Features for FREE with Animancer Lite then seamlessly upgrade to Animancer Pro if needed.
It has plenty of detailed Examples to get you started, an extensive User Manual that explains how everything works, and even an introduction to C# in Unity in case you are new to programming.