Douane is described as 'personal firewall that protects a user's privacy by allowing a user to control which applications can connect to the internet from their GNU/Linux computer' and is an app in the Security & Privacy category. There are 2 alternatives to Douane for Linux and Mac. The best alternative is Little Snitch. It's not free, so if you're looking for a free alternative, you could try OpenSnitch.
- 2 alternatives