project: https://download.tuxfamily.org/4232/wordpress//2018/05/gnu_volador.zip
Only lacking:
- bones 2.5D (simil blender)
- papagayo x-sheet (lst)
- bit better the interpolation (alpha channel)
- auto illumination of 2d shapes
- gmic colorize
And it is much better that Synfig Studio 
screenshot problem with alpha