Desmos is a free online graphing calculator with a wide variety of functions for student use. The site also features rich activities for students.
GeoGebra is a free and multi-platform dynamic mathematics software for schools that joins geometry, algebra and calculus.
I.M. provides instructional and assessment tasks, lesson plans, and other resources for math teachers.
To help students succeed in Algebra 1, Geometry, and Algebra 2, the University of Florida and Study Edge have expanded Algebra Nation to Math Nation – a FREE, online, easy-to-use resource aligned with the latest state standards.
The Math Learning Center The Math Learning Center is a resource for teachers who have limited manipulatives. Teachers can access geoboards, math racks, fraction bars, ten frames and number lines.
Mu Alpha Theta
Mu Alpha Theta is dedicated to inspiring keen interest in mathematics, developing strong scholarship in the subject, and promoting the enjoyment of mathematics in high school and college students.