Gufw - Gufw is an easy, intuitive way to manage your Linux firewall.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.
Windows 10 Firewall Control - Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.
netfilter - Netfilter software comprises iptables, ipset, conntrack-tools, libnetfilter and more.
TinyWall - Lightweight and non-intrusive firewall