Platypus - Realtime server monitoring and reporting
SevOne - SevOne provides network managers with monitoring, troubleshooting, and performance reporting capabilities.
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
Flowmon - Clever Network Monitoring and Security Solution based on NetFlow, IPFIX and Network Behavior Analysis
Monitornator - Server monitoring made simple
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.