Pencil is a very realistic sketching program and good 2D animation tool for the cost (free).

Pencil2D is an easy, intuitive tool to make 2D hand-drawn animations. Pencil2D is open source and cross-platform. - ChatGPT-CN/pencil_2D ...

Pencil2D is an easy, intuitive tool to make 2D hand-drawn animations. Pencil2D is open source and cross-platform. - thomnath/pencil_fork_464 ...