Compressify - Compress video files by 20-60%
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.
Big Photo - Overcome the image resolution limit on iOS devices
Squash 2 for Mac - The easiest way to compress and optimize images for the web
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.