OpenModelica

OpenModelica

Native Application

Developer(s)	Open Source Modelica Consortium (OSMC)
Latest release	1.25.0
Status	Active
Operating System	Linux, macOS, Windows
Language(s)	Modelica
License	OSMC Public License
External links
Website	openmodelica.org
GitHub	OpenModelica/OpenModelica
Bug tracker	GitHub
Documentation	OpenModelica System Documentation

OpenModelica is an open-source modeling and simulation environment for the Modelica language, used for designing, simulating, and analyzing complex dynamic systems. It provides tools for creating models, running simulations, and visualizing results, supporting applications in engineering and science.

Installation

nix-shell -p openmodelica.combined

This is not working. There are several problems:

1. The installed version will be 1.18.0 but currently (2025-06-09) the latest version is 1.25.0.
2. One dependency is qtwebkit but this is currently (NixOS 25.05 (Warbler)) marked as an insecure package.
   1. When allowing qtwebkit as insecure package to be installed then during the build process of qtwebkit there are compilation errors.

Build from source

See here (working for NixOS 25.05 as of 2025-06-10): https://github.com/MBanucu/NixOS2505BuildOpenModelicaFromSource