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Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
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.
CrossBrowserTesting - Browser Testing made simple! Run automated, visual, and manual tests on 1500+ real browsers and mobile devices. Test more browsers, in less time.
browserling - Live interactive cross-browser testing from your browser.
Litmus - litmus tests and tracks your email campaigns, so you can always put your best design forward.