Chrome Developer Tool - Develop and Debug Chrome Apps & Extensions. By Google
GitSpo - Measure & engage your open-source community
GitHub Student Developer Pack - The best developer tools, free for students.
Devo - Devo delivers real-time operational & business value from analytics on streaming and historical data to operations.
Spaceship ZSH - Powerful, customizable Zsh prompt, your own spaceship 🚀
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.