We examine the development of automaton-modeling multipurpose simulation systems as an efficient form of simulation software. Such systems constitute a singe problem–oriented package of applications based on general simulation model, which is equipped with task source language, interaction, and file management tools, and an output editor. The simulation models are described by the method of probabilistic-automaton modeling, which ensures standard representation of the modeling algorithm. An example of such systems includes the Demographic Forecasting System (DEPROG) main description of which is represented in the article.