This is Finbook version 1.5.6. Finbook is an animation tool that lets you draw flipbooks frame by frame, and which supports rigid deformations of objects.
This is an alpha release: some features are not yet supported, like drawing in different colours. However, you can sketch objects, make new objects, copy/delete/make new frames, and also deform an object (click to add at least two constraints, drag on a constraint to deform, ctrl-click to remove, shift-click to translate). You can save a finbook to text and load it again. And of course, you can play the animation, at 10 FPS.