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Free Windows firewalls found better than commercial ones

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broken85:
I wish I could find a decent lightweight (read: non-system-or-network-affecting) firewall whose sole purpose was to block malicious outbound connections. I have no need for software filtering of in-bound data since my router does that without any overhead, but I wouldn't mind being able to enable outbound protection in a really lightweight client when working on my PC, as a safeguard against, for instance, making a bad software installation decision and having unauthorized sensitive data get sent out, which my router of course would care less about.

Has anyone heard of or used something like this? Maybe there's a really lightweight firewall that I can just disable inbound filtering on, but I've never used one that I've found to be suited for such a purpose.

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