Resumen
This article is about the development tools for digital twins. Digital twins are getting more and more attention. At the same time, one cannot fail to note the fact that most of the publications consider the use of digital twins. How these twins were built (developed) is out of the question. Meanwhile, it is obvious that it is the questions of the development (creation) of twins that are primary. Any digital twin includes a model of a real object, presented in one form or another. This is what is called a digital replica. The paper deals with the relationship between systems for the development of discrete simulation models and digital twins. Discrete event modeling is one of the oldest and most widely used approaches to building modeling systems. The paper discusses add-ons for discrete-event modeling systems, which will allow the use of such tools for the development of digital twins. Such systems will also be important for universities in terms of training in the development of digital twins.