A free program for Android, by KidsAppBox.

Kids Learning Box: Preschool is an educational game designed for preschool-aged children. The objective of the game is to teach preschool-aged children the basics of reading, writing, counting, and recognizing different colors and shapes. It is designed to be fun and interactive, and the interface is very intuitive and easy to use. The game consists of 10 different categories, which include:

Learning Numbers: Preschoolers can learn numbers up to twelve. They will use the counting game to practice their numbers. 

Learning Letters: Kids can learn the alphabet. The interface is very easy to use, and the different categories make it fun and interactive.

Learning Colors: This category consists of basic colors. Your kids will learn to identify colors and draw them on a canvas.

Learning Shapes: This category consists of basic shapes. Your kids will learn to identify shapes and draw them on a canvas.