A wide range of mathematics and engineering calculators for both mobile phones and PCs. We have a unique set of applications in matrices, algebra, calculus, differntial equations, scientific calculations, and plot graphs. We also have applications dedicated for engineering design and research. The user is allowd the chance to in put the problem requirewments and then he gets the steps for solving such problem. We also have smart applications that can solve differential equations symbolically. The users inputs the differential equation in symbolic format and he gets the solution also in symbolic format. We have, for example, engineering calculators that solve digital signal processing design problems for the user.