Is It Down Right Now? - Network & Admin
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.
UPDOWNtoday - UPDOWNTODAY allows you to check whether the website is down or not.
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
Site Down - Site down outage and downtime reports from SiteDown.co
OpenSpeedTest - Broadband Internet Speed Test Unlocked!