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.
Fiddler - Fiddler is a debugging program for websites.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Websecurify - Websecurify free and premium security tools automatically scan websites for vulnerabilities like SQL Injection, Cross-site Scripting and others
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.
Proxyclick - Connect with Confidence