Paint.NET - Paint.NET is a free image and photo editing software.
Pixelitor - Pixelitor is a cross-platform raster graphics editor written in Java.
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.
KolourPaint - KolourPaint is a free, easy-to-use paint program for KDE (a desktop environment for UNIX).
RealWorld Photos - RealWorld Photos is an free portable photo editor for Windows.
Microsoft Paint - Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included...