What are some alternatives?
When comparing Filseclab Personal Firewall and Firestarter, you can also consider the following products
TinyWall - Lightweight and non-intrusive firewall
ZoneAlarm Free Firewall - Personal Firewall software
Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.
Gufw - Gufw is an easy, intuitive way to manage your Linux firewall.
Windows 10 Firewall Control - Windows 10 Firewall Control: simple and exhaustive solution for applications network activity controlling and monitoring.
OpenSnitch - OpenSnitch is a GNU/Linux port of the Little Snitch application firewall.