Website Image Speed Test - Beautiful & easy free analysis of the images on your page
Pixpie - Optimize your images and speed up your site on WordPress
Pingo - Optimize images for the web quickly 🖼️⚡
Imagify - Optimize and resize images online and through your CMS.
Dither Me This - Reduce image file sizes in a stylish old-school way.
OptimizeWP - WordPress speed optimization and maintenance service