Ranorex Studio supports test automation on a broad array of platforms, from legacy desktop applications to the latest web and mobile technologies. Ranorex Studio tools help teams automate faster, identify defects, and reduce test maintenance, so that you can focus on delivering quality applications.
browserling - Live interactive cross-browser testing from your browser.
TestComplete - TestComplete Desktop, Web, and Mobile helps you create repeatable and accurate automated tests across multiple devices, platforms, and environments easily and quickly.
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
CrossBrowserTesting - Browser Testing made simple! Run automated, visual, and manual tests on 1500+ real browsers and mobile devices. Test more browsers, in less time.
Selenium - Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.
Browsershots - Browsershots makes screenshots of your web design in different browsers.