Little Snitch comes to Linux, but the core logic is closed source - https://the.unknown-universe.co.uk/privacy-security/little-snitch-linux/

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Little Snitch on Linux

Why I’m skipping the new Little Snitch for Linux in favour of my existing, transparent AdGuard Home and OpenSnitch setup.

The Unknown Universe
Little Snitch comes to Linux, but the core logic is closed source | Hacker News