Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
CCProxy - Want to share Internet connection? Get every computer online through a single Internet connection?
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
Apache Traffic Server - Fast, scalable and extensible HTTP/S 2 and 1.1 compliant caching proxy server.
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.
3proxy - 3proxy freeware proxy server for Windows and Unix. HTTP, SOCKS, FTP, POP3