Some folks have been asking for this so here it is : Free Software to make 2d animation.
Synfig
https://www.youtube.com/watch?v=FzmDI…
https://www.youtube.com/watch?v=8p5Aj…
Blender
https://www.youtube.com/watch?v=gmH_6…
Pencil
https://www.youtube.com/watch?v=SHjQ3…
Tupi
https://www.youtube.com/watch?v=R4LK6…
https://www.youtube.com/watch?v=fk_kS…
