GitSpo - Measure & engage your open-source community
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.
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
SimilarSites - Easily find more sites like those you like.
Ruby Toolbox - Explore and compare open source Ruby libraries
Product Hunt - A website that lets users share and discover new products