MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Microsoft Paint - Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included...
PixBuilder - Free Photo Editing Software for PC
GIMP - GIMP is a multiplatform photo manipulation tool.
PhotoFlare - Quick, simple but powerful Cross Platform image editor.