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.
Milanote - Milanote is a note taking app for creative work.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
ScribbleBoard - iOS8 Keyboard for hand drawing your messages
GIMP - GIMP is a multiplatform photo manipulation tool.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.