ImageOptim - Faster web pages and apps.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Node.js - Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Ruby on Rails - Ruby on Rails is an open source full-stack web application framework for the Ruby programming...
Postman - The Collaboration Platform for API Development