Regex Crossword - Welcome to the fantastic world of nerdy regex fun!
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
i Hate Regex - regex cheatsheet for the haters
Endpoints - View and respond to requests on an HTTP endpoint
POSThere by Path - Debug ALL the POST Requests
httpbin(1) - HTTP request and response service