Apps similar to Forefront Threat Management Gateway include OPNsense, which is free and open source. Other options are ClearOS, Endian Firewall Community, WinGate and CacheGuard Gateway. You can choose from more than 10 Firewalls like Forefront Threat Management Gateway for Linux, self-hosting, the web and Windows.
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.
Netherlands
EU
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.
United States
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...
ItalyEU
WinGate Proxy Server is a highly capable integrated Proxy server, firewall and email server designed for access control, security and communications needs. What you do get is all the features of Standard license for 3 concurrent users.
New Zealand
CacheGuard Gateway is a free, open-source network security appliance for startups, growing businesses, and SMEs/SMBs that need enterprise-grade protection without the complexity or cost.
FranceEU
Sophos UTM integrates complete security software within a single appliance. Choose only the protection you need when you need it. And deploy it on the platform that best fits your business: software, hardware or virtual appliance.
United Kingdom
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.
United Kingdom
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.
ItalyEU
Protect your network from viruses, malware and malicious activity with Kerio Control, the easy-to-administer yet powerful all-in-one security solution.
United States
A modern replacement for Sophos UTM based on Sophos, Cyberoam and Astaro technology combined.
United Kingdom
