Checkthe.website is the simplest uptime monitoring tool for individuals.
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Net Uptime Monitor - Net Uptime Monitor is a simple internet connection monitor that alerts you to connection failures and records their exact time and length
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
UptimeRobot - Free Website Uptime Monitoring
PingDoctor - PingDoctor is software that is considered to be the most powerful and easiest to use network route analyzer.
Internet Connectivity Monitor - This a lightweight program that provides you with a way to monitor your internet connection uptime.
Fping (open source) - fping is a program to send ICMP echo probes to network hosts, similar to ping, but much better performing when pinging multiple hosts.