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.
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
Open Nettest - Open Nettest is a platform for collecting, processing and visualizing data related QoS and QoE.
PingDoctor - PingDoctor is software that is considered to be the most powerful and easiest to use network route analyzer.
OpenSpeedTest - Broadband Internet Speed Test Unlocked!
KeyCDN Tools - Website speed test, online curl, ping tool, https/2 and other services