VIDE stands for Vectorized Image Deformation Engine, and is a powerful bone-based 2D image and vector art animation engine. It is written entirely in Haxe/NME, and so is available on many platforms. While released, the engine will remain proprietary until Fancy Fish Games has made their first game using it and fixed all the kinks.
A screenshot of the VIDE Editor. It is fully functional, with many animation features including bone animation of vectors and images, motion paths, and more.