ImageOptim - Faster web pages and apps.
ImageMagick - ImageMagick is a software suite to create, edit, and compose bitmap images.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Phatch - Phatch = Photo & Batch!
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
FCorp Imaging - Imaging is a Collection of Image Related Tools (Image Viewer, Image Converter, Image Resizer, Image...