I absolutely adore Krita, it really is one of my favourite programs. It's very intuitive in its controls and very good at "getting out of the way" when you're p

I absolutely adore Krita, it really is one of my favourite programs. It's very intuitive in its controls and very good at "getting out of the way" when you're painting. For example, it has a quick-selection wheel that pops up when you press right mouse button. It's a radial design with the outer layer being your favourite brushes, then your last used colours and in the middle it has a colour-selection triangle. This means that if you're drawing in full-screen mode (hiding all the controls) you hardly ever have to switch back to the menus to tweak stuff (changing brush size is also done by holding shift and dragging), only to switch layers really. (that is my work-flow at least) And, if anyone is looking for an OSS project to contribute too: Development is very active and open, it's written in C++ Qt/KDE. :)