Do you have any recommendations for a firewall for a desktop Linux system? I've been looking into an application based one, landed on OpenSnitch, but I don't know if I can trust it.

firewalld is what is installed by default, but seems like overkill and complicated. I do not have enough knowledge of Linux yet, just enough to get into trouble but not how to fix.

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Did you find anything?

Seems like there's not a lot of choice for firewalls, especially app based ones. OpenSnitch is the only game in town. Happy to be wrong, would love alternatives.

I ended up learning more about firewalld for my situation, but far from ideal.