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...
Plasma Firewall - Plasma Firewall is an open-source control panel with which you can manage your system firewall.
Windows 10 Firewall Control - Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.
Nufw - NuFW is a GPL extension to Netfilter (that is Linux firewall). It adds identity-based filtering, i.
TinyWall - Lightweight and non-intrusive firewall