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simplewall
Discontinued Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your computer.
Are you referring to Portmaster? https://github.com/safing/portmaster/
If so, it "is currently not available for macOS". https://docs.safing.io/portmaster/install/status/mac
There is a pull request adding network namespace support to systemd-networkd: https://github.com/systemd/systemd/pull/14915
I have read that some use NetworkManager by running a whole separate instance of it in their netns, along with a a D-Bus broker running in there too for clients to communicate with NM.
I use OpenSnitch on Linux which is great, and if you are looking for a similar software for Windows I can recommend simplewall.
https://github.com/henrypp/simplewall