OPNsense

Untangle NG Firewall

Untangle NG Firewall is a modular next-generation firewall platform that consolidates network security functions like content filtering, intrusion prevention, ransomware protection, and VPN into a single console instead of requiring multiple separate vendor products. Following its acquisition, the product now operates under Arista Networks as part of the Edge Threat Management (ETM) platform, with NG Firewall remaining the core product and a cloud-based ETM Dashboard, including a mobile app, for centralized management. The platform is aimed at organizations that need enterprise-style network security without a large in-house security team, and it is used across education (K-12 and higher ed), government, healthcare, financial services, nonprofits, and hospitality. Special pricing is available for qualifying public institutions, nonprofits, and government organizations, and a free trial and online purchase configurator are offered directly on the site.

IPFire

IPFire is an open-source Linux distribution built specifically to run as a firewall and network security gateway. It provides stateful packet inspection, network segmentation with DMZ and guest zones, and a web-based console for managing rules and monitoring traffic in real time, running on ordinary commodity hardware or as a virtual appliance. Beyond basic filtering, IPFire integrates Suricata-based intrusion detection/prevention, WireGuard, OpenVPN, and IPsec VPN support, a community-maintained domain blocklist, and an IP geolocation database for location-based rules. It is free and open-source with no paywalled features, while Core Updates ship regularly and commercial appliances and support are available separately.

WatchGuard Firebox

WatchGuard Firebox is a line of next-generation firewall (NGFW) products spanning physical appliances, virtual instances, and cloud deployments. The lineup includes tabletop T Series appliances for small businesses and rackmount M Series appliances for enterprises, plus FireboxV for virtualized environments and Firebox Cloud built specifically for AWS and Azure. Its Unified Threat Management services bundle AI-powered antivirus and advanced threat protection with sandboxing. Firebox also provides enterprise-grade VPN for secure remote access and, through FireCloud Gateway integration, zero trust access so remote users and private applications can be reached securely through the same appliance. WatchGuard positions Firebox for small and medium businesses, distributed enterprises with multiple locations, and organizations needing cloud infrastructure security, with flexible modular licensing and pricing available directly from the company.

pfSense

pfSense is an open-source firewall and router platform built on a hardened FreeBSD base, offering enterprise-grade capabilities like Snort-based intrusion detection and prevention, traffic shaping, native IPv6, and site-to-cloud VPN connectivity. It is free to run as Community Edition software on your own hardware or as a virtual machine. For organizations that want a managed path, developer Netgate sells physical hardware appliances, virtual appliances on AWS and Azure starting around $0.08/hour, and commercial support and training. pfSense is used from small offices to large enterprises for firewalling, routing, and VPN connectivity between sites and clouds.

Webmin

Webmin is a free, open-source web-based system administration tool for Unix-like servers, with roughly one million installations worldwide. It lets administrators configure operating system internals such as users, disk quotas, and services, and manage popular open-source software including BIND DNS, Apache, PHP, and MySQL through a browser. Recent releases have added modules for nftables firewall management, Nginx configuration, and systemd service control, plus enterprise-oriented features like role-based access and two-factor authentication. Its companion projects, Usermin and Virtualmin, extend it into a user-facing panel and a full hosting control panel respectively.

Sophos Firewall

Sophos Firewall is a next-generation firewall designed to serve as the central hub of Sophos's broader network security platform, coordinating automated responses with endpoint, email, and workspace protection products. It uses Xstream architecture for accelerated traffic handling, deep packet inspection, and AI-powered zero-day threat detection, all managed through the cloud-based Sophos Central console.