Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
skribbl - Word guessing based on drawing.
Clip Studio Paint - The artist's software for drawing and painting.
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
gartic.io - Draw, guess, and win!