Package gween provides the Tween struct that allows an easing function to be animated over time. This can be used in tandem with the ease package to provide the easing functions.
Package gifresize resizes animated gifs. Frames in an animated gif aren't necessarily the same size, subsequent frames are overlayed on previous frames. Therefore, resizing the frames individually may cause problems due to aliasing of transparent pixels. This package tries to avoid this by building frames from all previous frames and resizing the frames as RGB.
Package easings - Useful easing functions for values animation A port of Robert Penner's easing equations (http://robertpenner.com/easing/)