Automation testing service to verify your business-critical flows are working as intended nightly and on demand.
BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
TestingBot - Automated and Manual Browser and Device testing.
browserling - Live interactive cross-browser testing from your browser.
Browsershots - Browsershots makes screenshots of your web design in different browsers.
Ghost Inspector - Easily create automated browser tests for your websites and web apps. Ensure everything works and looks the way it should. No coding required. 14 day free trial!
IE NetRenderer - Free online HTML tool that shows instantly how your website looks like in Microsoft Internet Explorer 7, 6 and 5.5.