TinyWall - Lightweight and non-intrusive firewall
ufw - Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
ferm - ferm is a tool to maintain complex firewalls, without having the trouble to rewrite the complex...
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.