Kid Coloring is a colouring tool for kids, is totally free, and there is no ads.

The Best App on Analog Electronics for engineering, Learn any topic in a minute

Teach your kids human body with fun!

Letters, Math, Puzzles, Sizes, Matching, Colors, Shapes, Patterns and more!

A fun Russpuppy game for little kids that like big dinosaurs

Math and science done right

Design and calculation of spur and helical gears.