HTTPDump - A simple, beautiful Webhook debugging tool.
RegexBuddy - RegexBuddy is your perfect companion for working with regular expressions.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Expressions - An app to play with regular expressions. Easily and nicely.
LightStep Sandbox - How quickly can you debug an error in a distributed system?
Patterns - Patterns is a simple yet powerful tool for working with regular expressions.