Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Kite - Kite helps you write code faster by bringing the web's programming knowledge into your editor.
Reactime - Time travel debugging tool, visualizing and tracing state
Remote Duck - Stranger on the Internet that can help you debug your code
Sonar by Facebook - Extensible mobile app debugging for iOS and Android
Sublime Tutor - Learn Sublime Text from a tutor who sits inside the editor