Zabbix - Track, record, alert and visualize performance and availability of IT resources
TinyWall - Lightweight and non-intrusive firewall
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Windows Firewall Control - Windows Firewall Control is not the built in firewall system in the Windows operating systems.