Zorp GPL is a unique open source proxy firewall with deep protocol analysis capablities.
It makes network traffic comply with protocol standards and allows specific measures on every level of the ISO/OSI modell. Zorp GPL also helps to maximize control over the traffic passing your perimeter to achieve ultimate network security. It gives you all the power you may need to implement the most complex local security policy without giving up anything.
Free license. Active community support. Zero compromises.