[The01Sketch]

http://mypaint.intilinux.com/

MyPaint is a fast and easy open-source graphics application for digital painters. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.

1. exists for several platforms (Win,Mac, and Linux)
2. supports pressure sensitive graphics tablets
3. extensive brush creation and configuration options
4. unlimited canvas (you never have to resize)
5. basic layer support