MyPaint is a free and open-source painting program developed by Martin Renold from Switzerland in 2005. It has garnered a dedicated following among digital artists, illustrators, and hobbyists alike, primarily due to its focus on simplicity and ease of use.

Krita (formerly called KImageShop, Krayon) is a free, open-source and cross-platform digital painting software developed by Krita Foundation (part of the KDE Community) from Sweden. It is fully functional, capable of the entire painting process from drafting, lining, coloring to post-adjustment; can draw concept sketch, illustration, cartoon, animation, scene and 3D mapping; supports digital board, pressure sensing, anti-shake, layers, filters, color management, and other functions.