Optimage - Advanced image optimization tool
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.
Crunch - Crunch is a No Judgment Gym that believes in making serious exercise fun by fusing fitness and entertainment. Join Crunch for all your fitness needs!
Squash 2 for Mac - The easiest way to compress and optimize images for the web
ImageKit.io - Instant multi-platform image optimization
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.