Smaller - Make your websites load faster
browserling - Live interactive cross-browser testing from your browser.
Cloudinary - Cloudinary is a cloud-based service for hosting videos and images designed specifically with the needs of web and mobile developers in mind.
BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
Global Website Speed Test - Test website load speed from 18 cities, including 3 in China
Browsershots - Browsershots makes screenshots of your web design in different browsers.