What are some alternatives?
When comparing Filseclab Personal Firewall and OpenSnitch, you can also consider the following products
TinyWall - Lightweight and non-intrusive 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.
LuLu by Objective-See - LuLu is the free open-source macOS firewall that aims to block unauthorized (outgoing) network...
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
ZoneAlarm Free Firewall - Personal Firewall software