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.
GitNews App - Trending repositories from GitHub, HackerNews & Reddit
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.
Tech Overdose - A tech aggregator for dev junkies 👨💻
GitSpo - Measure & engage your open-source community
nuTab - Capture your thoughts and favorite links on the new tab page