Zorp GPL is a next generation, open source proxy firewall with deep protocol analysis. It allows you to inspect, control, and modify traffic on the application layer of the ISO/OSI model. Decisions can be made based on data extracted from the application-level traffic (for example, HTTP) and applied to a certain traffic type such as users or client machines. It ensures that the traffic complies with the particular protocol standards, and allows you to perform specific actions with the traffic.