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Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Sonar by Facebook - Extensible mobile app debugging for iOS and Android
HTTPDump - A simple, beautiful Webhook debugging tool.
Reactime - Time travel debugging tool, visualizing and tracing state
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.
prism.js - Prism is a lightweight, extensible syntax highlighter, built with modern web standards in mind.