darktable is an open source photography workflow application
Image management application
Free and open source voxel art tools - editor, thumbnailer and format
An award-winning drawing program for children of all ages
Swiss army knife of image processing
Model Railway CAD program
Display, convert, and edit raster image and vector image files
French Geographic Information System
Convert Netpbm programs to GIMP plug-ins
3D Procedural Modelling and Procedural Texturing Tool in OpenGL/C++
Deep paint and stop-motion animation software