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Speedtest.net - Test your Internet connection bandwidth to locations around the world with this interactive broadband speed test from Ookla
Speedtest by Ookla - Measure your ISP's performance in a click
nPerf - nPerf brings you the best and the fullest mobile connection quality measurement tool up to 1 Gb/s...
LibreSpeed - Self-hosted Speedtest for HTML5. Easy setup, examples, configurable, mobile friendly.
Fast.com - Quickly test your internet speed with this fast-loading speed test powered by Netflix.
speedtest-cli - Test your download speed using SpeedTest on the command-line