Pixel Art Puppet Tool

+GIF export. 

+Sheet Import

A bit hard to use, but it works great for me for 64x64 sprites; 

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To get you started to understand how it works, follow these step by step:

Tutorial: 'Test Sprite' (top right button) -> Add pins with Pin Tool (on by default, cursor is a double circle) -> Add a master keyframe (KF) on frame 1 -> Add a keyframe on frame 16;

Pick a frame in the middle, let's say frame 7 -> Pick Move Tool (cursor will become a cross) -> Move pins with move tool to create a new deformation for the sprite -> add keyframe to frame 7 -> press Play; 

(Make sure that animated pin exists for keyframe 1 and 16)

(Chains icon on the top is a toggle to 'Keep Mesh', so 'triangles' are not being redrawn if your mesh is highly distorted)

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If result is great: press 'Export Puppet' -> you will get a .png sprite sheet

If you want more fine tuning: press 'Bake Animation' -> On the very right of 'Pixel Editor', press arrow, it will open a pixel editor for every frame. 

[Baking is done with 64x64, you will need to change that in the 'Export - size:' to Bake into a different resolution]

After fine tuning with Pixel Editor, press 'Export Pixel' and you will get sprite sheet from Pixel Editor; 

If you want GIF - pick the format option and do the same.