Fast.com - Quickly test your internet speed with this fast-loading speed test powered by Netflix.
LibreSpeed - Self-hosted Speedtest for HTML5. Easy setup, examples, configurable, mobile friendly.
speedtest-cli - Test your download speed using SpeedTest on the command-line
SpeedOf.Me - SpeedOf.Me is an HTML5 Internet speed test. No Flash or Java needed!
Speed Test by Cloudflare - speed.cloudflare.com is a tool that allows you to measure the speed and consistency of your connection to the Internet. You can use it to verify that the speed your ISP promised you is the speed you are getting.
Meteor - Meteor is a set of new technologies for building top-quality web apps in a fraction of the time.