Top 8 SOA Application Gateways
IBM DataPower GatewayExpressway Service GatewayForum Systems Forum SentryAlcatel-Lucent OmniPCX Open GatewayTIBCO ActiveMatrix Policy ManagerActional IntermediaryBee Ware i-Suite XML Firewall
Since it is a gateway, it provides a lot of security features.
You don't have to have a separate DMC proxy because DataPower Gateway is an appliance and will take care of a lot of security features. These include data validations, encryption, as well as XML or any type of scripting or security threats that are present.