OPNsense is a free and open-source network security solution that offers everything you need to protect your network and more. The stateful firewall includes support for IPv4, IPv6, and live view on blocked or passed traffic, while the multi-WAN capability, including load balancing and failover support, provides a seamless and high-availability connection. OPNsense also features integrated support for virtual private networking, two-factor authentication, web filtering, and an intuitive user interface available in multiple languages. The software offers business-grade features and a commercial upgrade path for companies and professionals looking for additional commercial features while supporting the project. Testimonials from satisfied users highlight its simplicity and reliability.
https://opnsense.org/