Tuple - Tuple is a Mac-only remote pair programming tool for discerning developers
Fiddler - Fiddler is a debugging program for websites.
Kite - Kite helps you write code faster by bringing the web's programming knowledge into your editor.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
CrankWheel - Insanely simple, enterprise-friendly screen sharing, free for individual use.
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.