Optimage - Advanced image optimization tool
Img.vision - Image hosting & video hosting for eCommerce sellers
Aerate for macOS - Ridiculously good lossless image compression
UploadHouse - Thumbnail and resize your photos and images
Imagify - Optimize and resize images online and through your CMS.
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.