What about appliance created using open source OS like : - https://www.pfsense.org/products/ https://www.pfsense.org/products/ - https://www.clearos.com/product

What about appliance created using open source OS like : - https://www.pfsense.org/products/ https://www.pfsense.org/products/ - https://www.clearos.com/products/hardware/clearbox-overview https://www.clearos.com/products/hardware/clearbox-overview - http://www.endian.com/products-overview/ http://www.endian.com/products-overview/ - https://www.untangle.com/untangle-ng-firewall/appliances/ https://www.untangle.com/untangle-ng-firewall/appliances/