Simple GTK# Paint Program
Automatic batch cropping of images. Autorotation optional.
Create quality JPEG images with ease. Paste in an image and save.
Nik plugins on Ubuntu standalone or with Picasa3
Free yourself
Image editor / converter for MCU-based embedded projects
GIMP (GNU Image Manipulation Program) is a free image editor
Convert images to Ascii Art, with a lot of options and drawing tools
Standalone software for photo editing and digital painting.
Quick Image Editor
Kalka is a layer-oriented simple raster image editor with FX support
Cool and simple photo editor allowing anyone to make touch up pics.