pfSense (Netgate)

pfSense, powered by Netgate, is the premier open-source firewall solution. It offers incredible flexibility, allowing users to build custom hardware or purchase pre-configured appliances. Because it is based on FreeBSD, it is highly stable and supports a vast array of packages, from VPN servers to intrusion detection systems (Snort/Suricata). It is the gold standard for homelab enthusiasts, power users, and small businesses that want full control over their security stack without being locked into a proprietary vendor ecosystem.

While it requires more technical knowledge to set up, the community support is unparalleled.