LeanTween is an efficient tweening engine for the Unity 3d engine
To use LeanTween move the included Plugins folder into the root of your project (or move LeanTween.cs directly into any pre-existing Assets/Plugins folder).
Documentation can be found here: http://dentedpixel.com/LeanTweenDocumentation/classes/LeanTween.html
Examples here: https://github.com/dentedpixel/LeanTween/archive/master.zip