The Dude - MikroTik is a Latvian company which was founded in 1996 to develop routers and wireless ISP systems. MikroTik now provides hardware and software for Internet connectivity in most of the countries around the world.
TinyWall - Lightweight and non-intrusive firewall
Pandora FMS - Pandora FMS: Opensource monitoring software
SonicWall - SonicWall security solutions protects your network, systems, users and data from cyber threats.
cStatus - Monitor and scan a network.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more