PixiJS is a canvas library that can utilize WebGL for insanely fast rendering, plus it has all sorts of crazy filters and fun effects. You could always use GSAP to animate PixiJS objects (after all, GSAP can tween any property of any JS object), but it was a tad cumbersome with certain properties because they're tucked inside sub-objects in PixiJS's API, like object.position.x, object.scale.y, object.skew.x, etc. Plus PixiJS defines rotational values in radians instead of degrees which isn't as intuitive for most developers/designers. PixiPlugin saves you the headaches:
//old way (without