MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Microsoft Paint - Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included...
Invision - Prototyping and collaboration for design teams
KolourPaint - KolourPaint is a free, easy-to-use paint program for KDE (a desktop environment for UNIX).
Sketch - Professional digital design for Mac.