Fiddler - Fiddler is a debugging program for websites.
UI Cloud - The largest user interface design database in the world
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Platypus - Realtime server monitoring and reporting
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.
Reactive Search - UI components for building Amazon / Yelp like Search