A modern, cross-platform, 2D Graphics library for .NET
A powerful, free and open-source tool for TextureAtlases/Spritesheets
Resilient Image Library - successor to DevIL
A dithering software based around floats
A powerful tool designed to reconstruct an original image from pieces
Java Image Processing Program
BRIC is a powerful tool for batch image processing.
Open Source graphic tool and alternative to Insane Bump
Lean and fast image viewer with minimal GUI
Advanced image processing toolbox for Scilab on Unix/Linux/Mac OS
Add watermark to any image or photo (batch processing available).
View and alter images (batch processing available).
iwatermark is a image watermarking web application.