An approach to developing a mathematical knowledge base on special functions is described and an example of such a knowledge base is presented. The problem consists of creating a uniform structural approach to classification of special functions of different types. Such an approach was realized in a series of papers by the authors. Two variants of an experimental version of the SFTools knowledge base developed on the basis of such a classification are presented. The first variant is realized in the Delphi language and works in the environment of the Windows 95 and Windows NT operating systems. The second variant presents an Internet modification of SFTools; it is realized in the Java language.