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If anyone is interested in something (open source) like this for Windows: We are building Portmaster, which is a bit less nerdy, but features a "fancy" UI, advanced search and more: https://safing.io/

Edited to add: Linux is also supported, but IMHO this is the wrong target group for that. Not here to draw users from OpenSnitch, as it is great and fits perfectly for its use case. Very nice to have it included in debian. Big win for privacy!

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First thing I thought about as a Windows alternative was Simplewall, how does Portmaster compare to it if I may ask?

We just happen to have a blog post about that. ;)

https://safing.io/blog/2022/04/11/portmaster-vs-simplewall/

Does Portmaster have a map view of incoming and outgoing networks like LittleSnitch does?

We have all the required data, but not put on a map yet.

You can group connections by country in the meantime to get a feel for where things are going. (You can also group by multiple values for a bit more detail.)

Interesting, is this an NDIS x tcpview type program?

Pretty much. As far as I understood, NDIS was replaced by WFP (Windows Filtering Platform). We built our own driver that uses WFP and as such is on the same level as the Windows firewall itself, meaning we can veto its decisions.

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