pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Sophos UTM - Sophos UTM integrates complete security software within a single appliance.
Sqreen - Sqreen is a web application security monitoring and protection solution helping companies protect their apps and users from attacks. Get started in minutes.
WatchGuard - Award-winning solutions that are easy to deploy and manage, making enterprise-grade security accessible to any organization regardless of size or expertise.
TinyWall - Lightweight and non-intrusive firewall
Barracuda CloudGen Firewall - Barracuda's cloud-ready firewalls improve site-to-site connectivity and provide enterprises with uninterrupted access to applications hosted in the cloud.