Lightweight image viewer for Windows with animated GIF/WEBP support
Swiss army knife of image processing
Display, convert, and edit raster image and vector image files
Lynkeos is an astronomical webcam image processing software for OS X.
Convert Netpbm programs to GIMP plug-ins
Resilient Image Library - successor to DevIL
Rayshade raytracer
Deep paint and stop-motion animation software
Advanced image processing toolbox for Scilab on Unix/Linux/Mac OS
Library and tools for dealing with the RLE raster image format
The Utah Raster Toolkit 3.0, patchlevel 2
Bildster is an image processing library for educational purposes.
GIMP plug in to adjust images for panoramatic views
Free drawing software for Windows, Mac OS X, and Linux
LBP implementation in multiple computing platforms (ARM,GPU, DSP...)
A 3D equirectangular panorama viewer, in C/GTK+