http://www.monitortools.com/

    * Alerting
    * Application Monitoring
    * Cloud Monitoring
    * Database Monitoring
    * Enterprise Management
    * Environmental Monitoring
    * Event Log Monitoring
    * Network & System Monitoring
    * Network Diagnostic Tools
    * Network Traffic Monitoring
    * PC Monitoring
    * Performance Monitoring
    * Protocol Analyzing and Packet Capturing
    * Security Monitoring
    * Service Level Monitoring
    * SNMP Monitoring
    * VoIP Monitoring
    * Web Monitoring
    * Miscellaneous