Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
Website Image Speed Test - Beautiful & easy free analysis of the images on your page
Website Grader - Grade your website's strengths and weaknesses in seconds.
Pingo - Optimize images for the web quickly 🖼️⚡
Smaller - Make your websites load faster
Pixpie - Optimize your images and speed up your site on WordPress