OONI Probe - Mobile app from Tor Project to check if you're censored.

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.

HE.NET Network Tools - This suite of networks tools implements most of the network diagnostics that you need as a Network...

Ping Meter Gadget - Customizable, graphical, semi-transparent ping (latency) meter.

CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.

OpenSpeedTest - Broadband Internet Speed Test Unlocked!