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HE.NET Network Tools - This suite of networks tools implements most of the network diagnostics that you need as a Network...
KeyCDN Tools - Website speed test, online curl, ping tool, https/2 and other services
OONI Probe - Mobile app from Tor Project to check if you're censored.
Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.
PowerPing - Advanced command-line ping tool, lovingly inspired by Windows and Linux native tools.
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.