Board for Github - A webview based GitHub project app with native features
GitSpo - Measure & engage your open-source community
Elegantt for Trello - The most elegant way to manage your Trello projects
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
Trailer - Accelerate your GitHub workflow
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.