ImageKit.io - Instant multi-platform image optimization
GiftOfSpeed - How fast is your website from different parts in the world? Get a free detailed speed report, including fixable performance issues.
ImageResizer - Free online app to crop and resize images
Geekersoft Free Online Image Compressor - With this online image compression tool, you can quickly compress photos in JPEG, JPG, PNG, GIF and other formats and export high-definition images.
Teeny Tokyo - A surprisingly-powerful bulk image resizing app
Gumlet - Gumlet is an end-to-end video streaming and image delivery platform