OPNsense

OPNsense is a powerful, open-source firewall and routing platform built on FreeBSD that launched in January 2015 as a fork of pfSense. Founded by Deciso B.V. in the Netherlands, OPNsense has evolved into a comprehensive security platform with less than 10% of the original pfSense code remaining. The platform provides enterprise-grade network security features including stateful packet filtering, inline intrusion detection and prevention (IDS/IPS via Suricata), comprehensive VPN support (IPsec, OpenVPN, WireGuard), two-factor authentication, traffic shaping, load balancing, high availability with CARP failover, and web application firewall capabilities. OPNsense features a modern, intuitive web interface built with the Phalcon MVC framework, emphasizing security, code quality, and usability. The platform offers weekly security updates to respond quickly to emerging threats, with a fixed release cycle of two major releases annually (January and July). With over 300,000 community members worldwide and 4,000+ GitHub stars, OPNsense is widely adopted by MSPs, enterprises, and network administrators. Available in both free Community Edition and premium Business Edition with additional features like OPNcentral management, Web Application Firewall, and commercial support options.