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
network monitoring, network management, network diagnosis, graphic maps, IP monitoring, management, diagnostics, service monitoring, SNMP, TCP/IP,

 2)   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.
Applications Management, Server Monitoring, Database Monitoring, System Monitoring, Service Monitoring, Website Monitoring, JMX/SNMP Consoles, Application Availability and Performance, Business Service Management,

 3)   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.
server monitoring, service monitoring, smtp monitor, pop monitor, imap monitor, http monitor,