Synfig Studio is a free (free) and open source software that offers the ability to create cartoons with very high standards. To create cartoons you can use vector or bitmap graphics.
The application, although it comes completely free of charge, is a complete tool, capable of fully covering even the most demanding projects.
You can see the app's features in the following video:
Synfig Studio is an open-source 2D animation software designed with the ultimate goal of delivering endless creative capabilities with innovative technologies.
As you will see in application page, Synfig is fully supported with own Wiki documentation and forum.
You can download the latest version of the application from the following links: