KolourPaint is a free, easy-to-use paint program by KDE.
It aims to be conceptually simple to understand; providing a level of functionality targeted towards the average user. It's designed for daily tasks like:
* Painting - drawing diagrams and "finger painting"
* Image Manipulation - editing screenshots and photos; applying effects
* Icon Editing - drawing clipart and logos with transparency
It's not an unusable and monolithic program where simple tasks like drawing lines become near impossible. Nor is it so simple that it lacks essential features like Undo/Redo.
KolourPaint is opensource software written in C++ using the Qt and KDE libraries.