FILEminimizer Pictures - FILEminimizer Pictures compresses JPEG photos, TIFF, BMP and PNG images and pictures by up to 98%.
ImageKit.io - Instant multi-platform image optimization
Shrink O'Matic - Shrink O'Matic is an AIR application to easily (batch) resize (shrink) images.
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.
Mass Image Compressor - Mass Image Compressor is easy to use - a point and shoot batch image compressor and converter tool for Web site optimization, photographers, HTML game creator and casual Windows users.
Piio - Generates responsive images so you don't have to optimize