Web Load Speed Test - Test your website load speed from 6 locations at once
Website Grader - Grade your website's strengths and weaknesses in seconds.
Smaller - Make your websites load faster
Textalyzer - Analyze text readability and SEO parameters
speedtest-cli - Test your download speed using SpeedTest on the command-line
Speedtest by Ookla - Measure your ISP's performance in a click