Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
Windows 10 Firewall Control - Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
ZoneAlarm Free Firewall - Personal Firewall software
HTTP Headers - HTTP Headers allows you to quickly see the HTTP header information for the current URL.
TinyWall - Lightweight and non-intrusive firewall