1)   AdRem NetCrunch 3.1
Logical/physical topology mapping; tracking of device/service performance and status; routing maps; custom network views; notifications: email, ICQ, SMS, SNMP; corrective action; web access, event log, trends, reports; supports Windows, NetWare, SNMP

 2)   Simple Server Monitor 2.0.5
Simple Server Monitor is a powerful, yet easy to use server monitor. It allows you to monitor the status of your servers and web applications from your desk. Supports pop-up, e-mail, sound, launch external application, log file, and event log alerts.

 3)   ManageEngine Applications Manager 6
Applications Manager is a web-based monitoring tool that manages applications, servers, databases, systems, services, websites, and JMX/SNMP-based custom applications in a complex IT infrastructure. It also offers fault and performance management.