Algolia Places - Intelligent address autocomplete for any <input>
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.
Qikipedia - Instant Wikipedia summary cards on any web page
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.
Search Later - Save interesting article keywords to Google them later 🤓
GitSpo - Measure & engage your open-source community