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FOSS Firewalls (for Windows)?
(infosec.pub)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I like Simplewall.
By default, it blocks everything and shows you a popup whenever an app or service tries to make a connection, similar to LittleSnitch for MacOS if you're familiar with that.
The first few minutes can be a bit annoying as you figure out just how many background services in Windows are trying to phone home, but after that, great peace of mind knowing nothing will talk to the internet without you knowing.
Definitely overkill for most users, but if you don't mind the initial burden, highly recommend.