What are some alternatives?
BrowserStack - Test your website for cross browser compatibility on real browsers. Instant access to multiple desktop and mobile browsers. Get Free Trial.
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
Browsershots - Browsershots makes screenshots of your web design in different browsers.
LambdaTest - Free cross browser compatibility testing tool online to test on 2000+ desktop and mobile browsers. Get online virtual access to machines running real browsers and real operating systems on cloud.
browserling - Live interactive cross-browser testing from your browser.
khtml2png - khtml2png is a command line program to create screenshots of webpages.