We develop mathematical software which is very useful for engineers, students, mathematicians, physicians and everyone who wants to make the work with mathematic, physics and computer science easier and funnier. We develop software for Pocket PC and Windows as well as products which comprises the Pocket PC and Windows version of each application. This gives you the opportunity to have all the world of mathematic and computer science with you all the time. iFD Bundle contains all the applications in just one product. This is a software, that allows you to calculate basic and complicated arithmetic expressions, to convert values between any type of units, to work with a sufficient set of formulas (mathematical, physical, electrical, etc) and moreover to add your own formulas where you can add new formula categories, new formulas and their parameter description. It also gives you the opportunity to calculate the elements, perimeter and areas of geometric shapes as triangle, rectangle, parallelogram, trapezuim, circle and ellipse and to make charts from various functions.