Free simulation software OpenSIMPLY


OpenSIMPLY is an open source simulation software based on discrete event simulation approach. The project is built as a free runtime library fully compatible with Delphi and Lazarus / Free Pascal.

The modeling with OpenSIMPLY is suitable for person of any experience. The project contains two styles of computer simulation approach.

The easy one is the block simulation, where user connects the simulation blocks of a different types and enters the required parameters. The blocks are fully expandable in parameters and functionality.

The second approach is an advanced one, very similar to the Simula programming language. User can create more faster simulation model of any complexity. Even models in Simula with some adaptation can be used with.

The project package containes complete detailed documentaion, insight help (pop-up hints) for Delphi and Lazarus IDE's, and tutorial with executable examples for step-by-step learning.

Evaluate the examples of simulation models.

Watch the learning videos.

Areas of use

  • Network simulation OpenSIMPLY performs the network modeling for quite complicated cases. The network model is being created with the typical network simulation blocks. The total route of the packet over the network can be traced ... learn more
  • Traffic simulation The project was originally developed for traffic analysis with clear and simple modeling ideology. Built-in functions of traffic theory help to check the traffic simulation results for some degenerate cases, that gives a good possibility for model verification ... learn more
  • Scientific modeling Any characteristic of system being researched with the model requires several simulation points. For acceptable confidence interval the number of entities in the simulation model has to be great enough for every run-through especially for complicated systems. OpenSIMPLY runs fast, local or remote, with flexible formatted output for suitable forms, as for GUI as well as for console mode ... learn more
  • Education The use of OpenSIMPLY is quite useful for educational purposes. The clarity of Object Pascal helps beginners to make fewer mistakes due to programming language, but concentrate more on simulation approach learning. ... learn more

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Project features

  • Two styles of simulation. Even both styles can be used together. The simulation blocks can be used for the general description of system behavior, and the critical section can be written with advanced simulation technique.
  • Deferred statistics gathering mode enables to take into account the steady state of the model. Certainly, the global and the selected statistics gathering modes are presented in the project too.
  • Dynamic model. OpenSIMPLY gives full flexibility of the model behavior description. The blocks are allowed to relocate during the simulation. That means that the model can change its configuration on runtime.
  • Remote simulation. Functionally OpenSIMPLY is remote simulation ready. Execution progress of the model running on remote computer can be checked with programmable interruption of the simulation process.

Licenses and special requirements

OpenSIMPLY is free computer simulation software. For using any part of OpenSIMPLY in a non free product (including commercial use) an additional agreement has to be concluded.

For extra agreements as also for extra features not implemented in the project (blocks, rules etc.) please write a message in the section Feedback with the selected subject "special requirements". The reasonable conditions will be offered.

Further development of the project

  • Visual model designer (is underway)
  • Release for Linux (is underway)
  • Statistics report generator
  • Distributed simulation (parallel simulation)