I wanted something like Glasswire, but for Linux and free. I found only one project that did this, but it's been discontinued, so I decided to learn and build one myself. Still in progress.▲
Can't wait to test this. I've been looking for a program like this for ages! I'm hopeful that I can select which network interface it sees.
I use a VPN which creates its own network interface and so.. the programs all run through this. Away from my home computer for a few days, unfortunately.