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iTween

By Pixelplacement, Free

More "wow" for a lot less "ow". iTween is a simple, powerful and easy to use animation system for Unity.

Focusing on the established solutions and frameworks of projects such as TweenLite, Tweener, and other Flash-based tweening and interpolation systems, iTween is a battle-tested solution for streamlining production in the Unity environment.

If it needs to come alive; its shouldn’t be frustrating. iTween exists to help you reach your goals without making the journey difficult, allowing polish to coexist in tandem with production.

To take full advantage of the iTween tweening library check out the usage examples.

For even easier usage of iTween in C# check out the Native Extension for C#.
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Requires Unity 4.3 or higher. Update now.