OpenSIMPLY is open-source
discrete-event simulation software —
the entire code is available for anyone to review, adapt, and build upon.
This transparency gives you full control: you can see how the simulation engine works, fix any issues yourself,
or adapt the software exactly to your research or project requirements.
No black boxes, no vendor lock-in — just transparent, modifiable code that stays yours to use forever.
Written in Object Pascal, it compiles with Delphi and Free Pascal.
Lazarus, the free open-source IDE, makes working with the code simple and convenient.
OpenSIMPLY combines strong performance with very low resource usage — perfect for handling large simulations without slowdowns or high memory demands.
The simulation core runs independently of the interface, so it stays fast and stable across different operating systems.
Output is flexible and clear: you can get structured logs, individual values, or formatted tables in console or GUI mode — easy to analyze big amounts of data.
It is also
free software under GPLv3 (code) and FDLv1.3 (documentation), keeping everything truly open and accessible.
OpenSIMPLY
Free open source simulation software
