I've been using OpenSnitch on Linux for some time now as well. While the user interface can be finicky at times, it's generally working very well. My biggest annoyance would be creating robust rules for applications using runtimes like Python, Java, Node, Electron or even Wine. After a bit of trial and error, I often end up with a relatively complex regular expression for the specific command and its possible parameters, that may or may not work for all future invocations.
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