Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Intruder - Intruder is a security monitoring platform for internet-facing systems.
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.
Forcepoint Web Security Suite - Internet Security