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.
The State of European Tech - In-depth report by Atomico
GitSpo - Measure & engage your open-source community
vu - Dead simple Instagram client for Mac