Simulation modeling with Free Pascal
The OpenSIMPLY is an open source free software for simulation modeling with Free Pascal and Lazarus.
The source code is compatible with the last version of Free Pascal compiler and Lazarus component library.
The discrete-event simulation model can be created in a few lines
The source code of the project is also fully compatible with Delphi.
If you prefer Embarcadero Delphi, read here.