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Modelling and simulation of continuous and time discrete systems in the time and frequency domain. Best suited for the study of automatic control systems. Graphical, block oriented user interface with more than 80 basic blocks divided into various categories. (Sources, linear, nonlinear, plots, actuators, controllers, time discrete, converters, logic, miscellaneous, special and drawing.). Illustration and documentation of the diagrams with shapes (lines, rectangles, circles, etc.) and text. Creation of user-defined blocks in a special design window. Saving of frequently used subsystems in libraries for later reuse. The simulation results are presented as data series in tabular form as well as time, Bode, Nichols-Black and Nyquist diagrams which can exported to other applications for further processing. Computes the eigenvalues of linear systems. The program supports the investigation of systems with varying parameter values and different external stimulations. SimApp distinguishes itself from other similar products due to the intuitive handling and ease-of-use that provides utilizable results in a few minutes. In addition the user is supported by a detailed program help. SimApp exists in three different editions which distinguish themselves in terms of maximal system size, program functions and purchase price. Student can buy the program for an affordable price. There exists also a very affordable Light version.