Shorewall - The Shoreline Firewall, more commonly known as “Shorewall”, is high-level tool for configuring...
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
ufw - Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
ferm - ferm is a tool to maintain complex firewalls, without having the trouble to rewrite the complex...
HTTP Headers - HTTP Headers allows you to quickly see the HTTP header information for the current URL.