The best pfSense alternatives
The rest of Best Operating Systems, in this site's order: each with what it costs, where it runs and its record score.
OPNsense suits administrators seeking a self-hosted firewall and routing platform with VPN, failover, and intrusion-prevention capabilities.
OpenWrt suits users who want to customize embedded devices, particularly wireless routers, and are familiar with GNU/Linux and basic networking.
Kali Linux is for experienced penetration testers and security specialists who are familiar with Linux.
It suits administrators deploying Linux on servers, virtual machines, clouds or edge devices.
NuttX suits developers building software for embedded boards and devices across its supported processor architectures.
AlmaLinux OS suits users seeking a free enterprise Linux distribution without a commercial license agreement, including those looking for a CentOS…
Nix suits developers, test engineers, DevOps engineers, system administrators, data scientists, students, and open-source enthusiasts who are…
Nura suits people interested in extending the life of supported devices who are willing to learn how the system works and contribute to development…
It suits people preparing bootable storage for Raspberry Pi devices, including those setting up a device without a display who need credentials or…
Sailfish OS may suit organizations considering managed mobile deployments, including corporate or governmental use, as well as consumer or embedded…
It suits teams running Linux workloads on EC2 or in Docker containers, including local development outside AWS.
Ubuntu Touch may suit users interested in a mobile operating system they can study or modify, provided they have a supported device.
Debian suits people choosing a free operating system for personal computers or cloud virtual machines, including those who want to manage packages…
MX Linux suits people seeking a free desktop operating system for a desktop or laptop, including users who want Xfce, KDE or Fluxbox.
Photon OS suits developers and operators building cloud, edge, container, or Kubernetes environments.