TinyWall - Lightweight and non-intrusive firewall
Monitornator - Server monitoring made simple
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
OpsDash - All-in-one solution for monitoring servers, services, uptime and databases. Curated Dashboards. Rule-based alerting.
Windows Firewall Control - Windows Firewall Control is not the built in firewall system in the Windows operating systems.
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.