OPNsense includes most of the features available in expensive commercial firewalls, and more in many cases. It brings the rich feature set of commercial offerings with the benefits of open and verifiable sources.




The best open source alternative to pfSense is OPNsense. If that doesn't suit you, our users have ranked more than 25 alternatives to pfSense and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to pfSense are IPFire, ClearOS, NethServer and Endian Firewall Community.
OPNsense includes most of the features available in expensive commercial firewalls, and more in many cases. It brings the rich feature set of commercial offerings with the benefits of open and verifiable sources.




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.

ClearOS is a family of operating systems for the enterprise, small business, and home. There are three editions to choose from depending on your needs and suitable to your abilities. They are: ClearOS Enterprise, ClearOS Home, and ClearOS Core.



NethServer is an application manager for Linux servers. The product's main feature is the ability to easily and quickly install and manage instances of applications over multiple nodes. It allows users to deploy services, like [Nextcloud](https://alternativeto.




Endian Firewall Community (EFW) is a "turn-key" linux security distribution that turns every system into a full featured security appliance with Unified Threat Management (UTM) functionality. The software has been designed with "usability in mind" and is very...



The SmoothWall Open Source Project was set up to develop and maintain SmoothWall Express - a Free firewall that includes its own security-hardened GNU/Linux operating system and an easy-to-use web interface.



DynFi® Firewall is the first French Open Source firewall. The system integrates many filtering features and allows for the first time to manage a large number of your appliances. Available for free, DynFi Firewall has two images (with VGA or Serial return) compatible with...




IPCop Firewall is a Linux firewall distribution geared towards home and SOHO (Small Office/Home Office) users. The IPCop interface is very user-friendly and task-based. IPCop offers the critical functionality of an expensive network appliance using stock, or even obsolete...



OpenWISP is a free and open-source platform for efficient IT network deployment, monitoring & management. It allows automation of many aspects of networks: from configuration to monitoring, RADIUS, hotspots, mesh and firmware upgrades, all backed by the reliability of the...




Zeroshell is a Linux distribution for servers and embedded devices aimed at providing the main network services a LAN requires. It is available in the form of Live CD or Compact Flash image and you can configure and administer it using your web browser.



CacheGuard is a free open-source network security appliance for startups and growing businesses that need enterprise-grade protection without the complexity or the cost.

Read this: https://teklager.se/en/pfsense-vs-opnsense/ Especially the part under "Politics, drama & bad blood between the two projects"