Pencil2D It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics.

The basic features of Pencil2D are:
+ layers support (separated layer for bitmap, vector and soud part)
+ bitmap drawing
+ vector drawing
+ sound support

Krita is an application for working with raster images. It allows you to both create images from scratch and work with ready-made images. You can work from photos or scans, or start from scratch. Krita directly supports most graphics tablets.