MultiPing 

MultiPing is an application built for monitoring graphically one or more TCP/IP hosts, while providing detailed historical information about the collection period to monitor uptime and performance or to just keep track of general connectivity.
ping network monitoring network uptime

Easy Network Service Monitor 

Easy to use and low cost tool for network, applications and services monitoring, fault identification, notification and reporting as well as service level agreement monitoring and reporting.
server service level agreement sla network monitor network applications network availability network troubleshooting fault management network management

PingPlotter 

PingPlotter is an intuitive graphical network-troubleshooting & diagnostic tool. It uses a combo of Traceroute, Ping, and Whois to collect data quickly, and you can then focus on particular aspects of that data to determine where a problem is.
network troubleshooting diagnostic traceroute whois ping isp internet trace route