SimApp 2.6 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This software is an intellectual property of Buesser Engineering. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. SimApp lies within Education Tools, more precisely Science Tools.
From the developer:
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.).
You may want to check out more software, such as StatPlus 2007, GenScn or Flashcard Tables, which might be related to SimApp.