A Visual Editor for HOTween (a Unity Tween Engine), which can be used to animate any property of any object/Component in your project (also works with prefabs).
It is composed of two indipendent utilities (though very similar in usage): a global manager, where you can add multiple targets to animate, and a single Component, which can be directly attached to the GameObject whose Components contain the properties you want to animate.

Please note that you'll require the HOTween engine to be installed separately (also free on the Asset Store)

HOTween website
Unity Forums Thread