The best Operating System alternative to OPNsense is OpenWrt, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to OPNsense and three of them are Operating Systems so hopefully you can find a suitable replacement. Other interesting Operating System alternatives to OPNsense are IPFire and VyOS.
OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the...
IPFire is a server distribution with intended to use as a firewall. It focuses on flexibility, and scales from small to middle sized business networks and home networks.
VyOS is a community fork of Vyatta , a Linux-based network operating system that provides software-based network routing, firewall, and VPN functionality.
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