Product Comparisons - Compare any 2 software products
LibHunt - LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.
TestBox - Test drive your software options before you buy
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.
GitNews Web - Trending repositories from GitHub, HackerNews & Reddit
Awardo - The place to buy the right software