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
Internet Connectivity Monitor - This a lightweight program that provides you with a way to monitor your internet connection uptime.
UptimeRobot - Free Website Uptime Monitoring
PuTTY - Popular free terminal application. Mostly used as an SSH client.
SmokePing - Smokeping is a tool for measuring latency.
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.