Chrome Developer Tool - Develop and Debug Chrome Apps & Extensions. By Google
SmallDevTools - Handy developer tools with a delightful interface
GitHub Student Developer Pack - The best developer tools, free for students.
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Spaceship ZSH - Powerful, customizable Zsh prompt, your own spaceship 🚀
TextLab - TextLab is the fastest way to format, prettify, transform, hash, encode, and decode your data instantly!