MoveLib

MoveLib provides a number of helper functions that make complex, smooth tile and pixel-driven movement and collision handling much easier and more appealing.

This takes a lot of the headache out of designing collision tests and figuring out exactly how two objects are touching, and where they are in relation to one another.

Movelib provides you a lot of highly granular metadata. It is not a simple drop-in for games, however. You have to learn certain methodologies inherent to its design in order to take full advantage of it.

Documentation can be found here.