Little Visuals - Sign up to get 7 hi-res images zipped up in your inbox every 7 days. Use them anyway you want.
Simple Gallery System - ProcessWire
Yahoo! Smush.it™
Free Vector Graphics and Image
TinyPNG – Compress PNG images while preserving alpha transparency
Upload, Crop and Resize images in PHP | Freelancer ID
GraphicsMagick
jQuery Backstretch by Scott Robbin
