OPNsense is described as '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' and is a popular Firewall in the security & privacy category. There are more than 10 alternatives to OPNsense for a variety of platforms, including Linux, Self-Hosted, Windows, BSD and VirtualBox apps. The best OPNsense alternative is OpenWrt, which is both free and Open Source. Other great apps like OPNsense are pfSense, IPFire, MikroTik RouterOS 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...
pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more.
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.
Linux-based system converts standard PCs into customizable routers, featuring advanced firewall, VPN server and client, bandwidth control, QoS, wireless AP, captive portal, remote management, industry protocol support, automation, and scalable licensing for network needs.
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...
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...
Vilfo OS is an easy and powerful software enabling multiple simultaneous connections to VPN servers. It contains firewall, split tunneling, DNS leak protection, VPN killswitch, notifications and much more.
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.
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.
Microsoft Forefront Threat Management Gateway (Forefront TMG), formerly known as Microsoft Internet Security and Acceleration Server (ISA Server), is a network security and protection solution for Microsoft Windows, described by Microsoft as "enables businesses by allowing...
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...
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Read this: https://teklager.se/en/pfsense-vs-opnsense/ Especially the part under "Politics, drama & bad blood between the two projects"