TinyWall - Lightweight and non-intrusive firewall
Cobalt Strike - Advanced threat tactics for penetration testers.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Shodan - Shodan is the world's first search engine for Internet-connected devices.
Windows Firewall Control - Windows Firewall Control is not the built in firewall system in the Windows operating systems.
Censys - Censys helps organizations, individuals, and researchers find and monitor every server on the Internet to reduce exposure and improve security.