Math

Desmos Graphing Calculator FREE
Graph functions, create function tables, explore transformations, plot points, animate your graphs, and more. Contributed by Mike Oberdick.

Khan Academy FREE
Easily access and view over 42,000 videos. Contributed by Mike Oberdick.

DragonBox $5.99
Learn algebra. Super cool game. Five year old Molly Schneider is at Level 104. Challenge. Contributed by Brandt Schneider.