browserling - Live interactive cross-browser testing from your browser.
Choosy - Choosy opens links in different browsers as specified, according to rules, set by the user.
CrossBrowserTesting - Browser Testing made simple! Run automated, visual, and manual tests on 1500+ real browsers and mobile devices. Test more browsers, in less time.
MenubarX - MenubarX.app is a powerful Mac menu bar browser that can pin any webpage on your menu bar just like a native App.
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
OpenIn.app - Open links, mails and files in the apps you want