netfilter might be a bit more popular than Gufw. We know about 1 link to it since March 2021 and only 1 link to Gufw. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
2- You should set it up anyways gufw.org. Source: about 3 years ago
The netfilter subsystem handles this, it's part of the Linux Kernel and part of all linux distros that don't use a custom kernel. You can read more about it here. Source: about 3 years ago
TinyWall - Lightweight and non-intrusive firewall
Murus Firewall - Murus is a frontend for the OS X PF network firewall.
ufw - Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall.
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.
Firestarter - Firestarter is an Open Source visual firewall program.