AlertPing 

While your hosts are hanging-up,your income is falling. Stop it with "AlertPing"! Alert Ping verifies accessibility of your host computers! It is used for 'pinging' IPs, f.e. computers in your local area network or in the internet.
ping net monitor alertping

AlertPingPro 

While your hosts are hanging-up,your income is falling. Stop it with "AlertPing"! Alert Ping verifies accessibility of your host computers! It is used for 'pinging' IPs, f.e. computers in your local area network or in the internet.
ping net monitor alertping

Advanced Host Monitor 

HostMonitor is a system management tool that continuously monitors servers availability and performance. It has 55 test methods, 25 alert methods, highly flexible report and log manager. Package includes Log Analyzer, Web Service and other utilities.
monitor network monitor lan monitor ip monitor snmp monitor web monitor cpu monitor sql monitor advanced monitor tcp monitor

Visual Ping monitor 

Simple program for monitor speed of ping. Build temporary graphics.
ping host monitor graphics site log

EverWatch Server Monitor 

Freeware program to continuously monitor your web server's (or any other server's) up and down time. User-defined polling interval and detailed logging and performance statistics.
site monitoring server monitor everwatch server watch internet tools freeware free software