This paper introduces a software application that simulates the most common types of queues. It also compares the simulations results with the values that the mathematical model predicts for specific types of queues. Thus, the software we have developed has two academic aspects. The first one applies to its ability to simulate most of the queuing processes that take place in computer networks. Therefore someone who studies network modelling or computer performance analysis may use it to derive some practical results in a very convenient way. The second aspect of the software refers to the part of the application that simulates specific types of queue and it can be used as a guide for teaching network modelling. We believe that it is very easy for someone to understand the aspects of queuing theory even though he/she is not familiar with.