I have been building a small tool called netpeek. It lives in your terminal and shows you which programs on your machine are actually using the network, in real time. Not just that traffic is happening, but which process is behind it, and how much.
Most of the time your computer is chatting away to all sorts of places without telling you much about it. netpeek is my attempt to make that legible. You open it up and you can watch, app by app, what is reaching out and when.
A goal from the start was that it stays completely offline. It only watches what is already happening on your own machine. It does not phone home, it does not look anything up on the internet, and it does not open any ports of its own. It just observes.
It is still getting some polish, but it works and I use it daily. I am planning to release it as open source soon, so anyone can run it, read the code, and pick it apart. I will post a link here once it is public.
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