Years ago, I had an app called Kerio Personal Firewall. Back then, it was super simple and lightweight - every time an app wanted to open ports, it would prompt you to allow/disallow. Then it simply showed in its interface a list of all the connections that were incoming or outgoing, which apps were using them and which ports.
I am a networking newb, but I really liked this - I felt a bit more secure seeing a list of connections and knowing what they were attached to.
Are there any firewall type apps that do this sort of thing these days?
Edit: this is what it looked like back then https://www.flickr.com/photos/tony1861/401821909
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