pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Load Impact - How many users can my web site handle?
Cyberoam - Firewall
DataSunrise Database Security - DataSunrise Database Security Software secures the databases and data in real-time with high performance.
Meraki MX Firewalls - Cloud managed networking from Cisco Meraki. The easiest and most IT-friendly solution for enterprise networking needs.
Enterprise Security - Enterprise Security is a product of Protegrity that allows users to tailor the protection of their sensitive data to suit their needs.