Optimage - Advanced image optimization tool
Jollyshot - Ephemeral image hosting
Aerate for macOS - Ridiculously good lossless image compression
Image Host Company - ImbBB but with your own Google Drive to get source links for all your media (images, gifs, sounds, videos...).
Imagify - Optimize and resize images online and through your CMS.
ImageKit.io - Instant multi-platform image optimization