64. Desmos – Beautiful, Free Math

As nominated by Bruno Reddy.

Desmos wants to help every student learn math and love learning math. But “every student” is a lot of students. So they create digital math tools and let the Internet take them to anyone who wants them!

Desmos has built the best-in-class HTML5 graphing calculator, which millions of students around the world use for free. That calculator catches stellar reviews in app stores and from happy users on Twitter. The team also create activities on top of that calculator, helping students use a powerful tool to experience all the curiosity, beauty, and sense that math has to offer. Those activities were used so often by so many teachers around the world that the Desmos team decided to create an Activity Builder, helping every teacher create digital math activities that equal and exceed the activities created by the team themselves.