bh_gravitEase is a new animation tool that can save -hours- of work in the Graph Editor in Maya, and allows you to control spacing of ease-ins and ease-outs in a powerful and interactive way. It's -not- just another tweening tool! It uses the 'odd rule' AKA 'the law of falling bodies' to calculate smooth spacing between keyframes that can be interactively adjusted to push towards a more stylized or 'cartoony' feel.
This video gives a general overview of how it works :
And this video gives a full walk through of installing and using the tool :
Please note the price here is for individual licenses, for Studio/Site or Educational licenses please contact me directly at firstname.lastname@example.org