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.
Search Later - Save interesting article keywords to Google them later 🤓
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.
Cwiki - A Command line interface for searching Wikipedia!
JSter - JSter is a community-driven catalog of the most useful javascript libraries.
Neighborhoods.nyc - Hyper-local alerts targeted by NYC neighborhood