Firewall Builder - Firewall Builder is Open Source multi-platform firewall management software that supports Linux...
Fiddler - Fiddler is a debugging program for websites.
Shorewall - The Shoreline Firewall, more commonly known as “Shorewall”, is high-level tool for configuring...
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
ufw - Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall.
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.