Pretzel - Keyboard shortcuts for the app you're currently using
Google Stackdriver Error Reporting - Aggregates and displays errors produced by cloud services
Apptivate - A simple, beautiful hotkey manager.
Million.js - A fast, <1kb virtual DOM
Keysmith - Create custom keyboard shortcuts for your Mac and the web
Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.