Website Image Speed Test - Beautiful & easy free analysis of the images on your page
Prodibi - Prodibi innovative image solution enables you to display and share your photos in full res and high quality on your website, wordpress, social media and mobile.
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.
OptimizeWP - WordPress speed optimization and maintenance service
Smaller - Make your websites load faster
Global Website Speed Test - Test website load speed from 18 cities, including 3 in China