Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
HTTPDump - A simple, beautiful Webhook debugging tool.
Regulex - Open-source, regular expression parser and visualizer.
Proxy Manager for Google Chrome - Oxy Proxy Extension for Google Chrome: add and switch between multiple proxies, simple, one-click connection, works with any proxy provider of your choice.
Endpoints - View and respond to requests on an HTTP endpoint