Sophos UTM is described as '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' and is a Firewall in the security & privacy category. There are more than 10 alternatives to Sophos UTM for a variety of platforms, including Self-Hosted, Linux, Windows, BSD and VirtualBox apps. The best Sophos UTM alternative is pfSense, which is both free and Open Source. Other great apps like Sophos UTM are ClearOS, Endian Firewall Community, Sophos XG Firewall and Kerio Control.
very easy to use and inexpensive