Website Grader - Grade your website's strengths and weaknesses in seconds.
speedtest-cli - Test your download speed using SpeedTest on the command-line
Textalyzer - Analyze text readability and SEO parameters
Global Website Speed Test - Test website load speed from 18 cities, including 3 in China
Smaller - Make your websites load faster
Speedtest by Ookla - Measure your ISP's performance in a click