Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
ModSecurity - ModSecurity is an Open Source web application firewall developed by Trustwave's SpiderLabs.
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
Naxsi - NAXSI means Nginx Anti XSS & SQL Injection.
Cellist - Cellist is an all-in-one HTTP debugging proxy software designed for OS that provides a straightforward approach to put a proxy between the HTTP client and the internet.
Shadow Daemon - Shadow Daemon is a collection of tools to detect, record and prevent attacks on web applications.