Krita
Open Source
Krita is a professional free and open source painting program.
Photopea
Free
Photopea is a free online image editor, that runs without plugins. It can both read and save PSD files.
MyPaint
Open Source
MyPaint is an easy-to-use painting program which works well with Wacom graphics tablets and other similar devices.
Gimp Paint Studio
Open Source
GIMP Paint Studio is a great pack of designing components like brushes, dynamics, gradient etc.
Compare Autodesk SketchBook with alternatives
Compare Krita and Autodesk SketchBook and decide which is most suitable for you.
Compare MyPaint and Autodesk SketchBook and decide which is most suitable for you.
Compare Photopea and Autodesk SketchBook and decide which is most suitable for you.
Compare Gimp Paint Studio and Autodesk SketchBook and decide which is most suitable for you.