Website Speed Ranker - Compare how fast your website loads vs your competitors
Fast.com - Quickly test your internet speed with this fast-loading speed test powered by Netflix.
Website Grader - Grade your website's strengths and weaknesses in seconds.
LibreSpeed - Self-hosted Speedtest for HTML5. Easy setup, examples, configurable, mobile friendly.
PageSpeed Ninja - One-click page speed boost for WordPress
speedtest-cli - Test your download speed using SpeedTest on the command-line