3D graph is program for drawing mathematical equations in form of 3D graph. You can write whatever equation you like and use variables x and y as you like. You enter equation in text box at the top of the screen and press Draw button to draw it. You can then rotate 3D graph by moving finger across the screen and zoom in and out with + and - buttons at the bottom of the screen. There are some predefined great looking equations available by opening menu and select Favorites option. You can add equation to list of favorites with star button, and take picture of it with camera button which will be saved to 3DGraph folder on SD card. You can use settings menu option to fine tune your 3D graph. Home page: http://goo.gl/mldKM