Synfig Studio

Synfig Studio is a 2D animation software that uses vector and rasterized graphics, thus eliminating the need to create animations frames by frames and you produce more advanced 2D animations with fewer and fewer resources.

Since all the elements are vector-oriented, so you only need to think about pixelsation (which is very easy to do) when changing the size of the size-sized size of the size.

This tool is compatible with different level types: geometric, gradient, filters, transitions, and many more can be managed from all their program interfaces; That said, more advanced users will be able to take advantage of all the best paid features.

Synfig Studio is a very comprehensive application that comes with an online user manual (available on the developer's website) Use it (with a dose of patience) to create your own animation.