Comparison of firewalls

Columns: Firewall | License | Cost | OS
Forcepoint NGFW | Proprietary | Included on all Forcepoint NGFW devices | Proprietary operating system | OPNsense | Simplified BSD / FreeBSD License | Free / Paid | FreeBSD -based appliance firewall distribution | pfSense | ESF/ Apache 2.0 | Free / Paid | FreeBSD -based appliance firewall distribution | Untangle | GPL | Free / Paid | Linux -based appliance firewall distribution | Zeroshell | GPL | Free / Paid | Linux / NanoBSD -based appliance firewall distribution | SmoothWall | GPL | Free / Paid | Linux -based appliance embedded firewall distribution

Example questions:
What is the OS of the comparing firewall appliance that has 550+ employees across the Earth ? | What is the cost of the comparing firewall appliance that was created in 1994 as an IT reseller termed NetPartners ? | What is the license of the comparing firewall appliance that can be equipped on any IA-32 computer with almost any Ethernet interface ? | What is the comparing firewall appliance whose license allows users to use the software for any reason without burden for royalties ?

Answers:
Windows | Included on all Forcepoint NGFW devices | GPL | pfSense