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.
Another screenshot of the VIDE Editor. This one shows off bone manipulation and the revision history. VIDE stores revisions from all project members online.