GitSpo - Measure & engage your open-source community
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Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
Newsit - Find the discussion around the page you're looking at!
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.
Six Degrees of Wikipedia - Find the shortest path between two subjects