Top Alternatives to pfSense

ClearOS is a robust Linux distribution serving as a comprehensive server solution for small to medium-sized businesses. It provides a unified platform for networking, gateway, and server functions with a user-friendly web-based interface.

NethServer is a modular operating system optimized for small to medium businesses (SMBs) and branch offices. It offers a comprehensive suite of network services and unified threat management (UTM) capabilities, managed through an intuitive web interface. Built on CentOS, NethServer provides a stable and secure platform for essential IT infrastructure.

MikroTik RouterOS is a robust and versatile network operating system designed for MikroTik's RouterBOARD hardware. It offers a wide range of networking features, from basic routing and firewall capabilities to advanced QoS, VPN, and wireless management, making it suitable for a variety of deployments from small home networks to large enterprise and ISP infrastructures.

Untangle offers a comprehensive network security solution combining firewall, VPN, threat prevention, and content filtering in a single, unified platform designed for small to medium businesses and distributed enterprises.

Endian Firewall Community is a powerful, open-source Unified Threat Management (UTM) solution designed to provide comprehensive network security. It integrates firewall, gateway, VPN, web security, and email security features into a single, easy-to-manage appliance.

IPCop was a Linux distribution meticulously crafted to transform standard PC hardware into a robust, user-friendly firewall appliance. Designed with simplicity in mind, it provided essential network security features for small offices and homes.

Sophos UTM (Unified Threat Management) provides comprehensive network security by integrating a firewall, intrusion prevention, web filtering, email security, and more into a single appliance. It offers a robust and affordable solution for businesses of all sizes looking to protect their network infrastructure from modern threats.

Smoothwall is a robust, open-source firewall distribution built on a hardened GNU/Linux operating system. It provides essential network security and management features through an intuitive web interface, making it suitable for both home and small business use.