Simple GTK# Paint Program
Swiss army knife of image processing
An award-winning drawing program for children of all ages
Toolkit for working with and mapping geospatial data
Installs 180 Photoshop and GIMP Brushes, Plugins + Scripts fast
Deep paint and stop-motion animation software
Free yourself
Image Editor
Edit text tags in an ICC profile
HTML5 editor, free and open-source website builder based on Silex
A powerful C++ class library for image manipulation
automata editor
Open Source CAD