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Product Comparisons - Compare any 2 software products
ask-stack - Get answers from Stack Overflow directly in the Atom editor
TestBox - Test drive your software options before you buy
Stack Overflow for Teams - Everything you love about Stack Overflow in a private space.
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.