pfSense
Open SourcepfSense is an open-source firewall and router software distribution based on FreeBSD. It provides a powerful and flexible platform for a wide range of networking needs, from small home networks to large enterprise environments, emphasizing security, reliability, and comprehensive feature sets.
Key Features
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Free and Open Source with no licensing costs.
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Rich feature set comparable to enterprise-grade firewalls.
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Highly flexible and customizable through packages.