High-performance C++ library for multiphysics and multibody dynamics simulations
SU2: An Open-Source Suite for Multiphysics Simulation and Design
Multiphysics Object Oriented Simulation Environment: A robust, modern, extendable, finite element/finite volume framework that excels at creating complex multiphysics simulations.
A coupling library and ecosystem for partitioned multi-physics and multi-scale simulations, including surface and volume coupling.
Geant4 toolkit for the simulation of the passage of particles through matter - NIM A 506 (2003) 250-303
Scalable, portable, and adaptive multiphysics
Kratos Multiphysics (A.K.A Kratos) is a framework for building parallel multi-disciplinary simulation software. Modularity, extensibility and HPC are the main objectives. Kratos has BSD license and is written in C++ with extensive Python interface.
SPHinXsys provides C++ APIs for engineering simulation and optimization. It aims at complex systems driven by fluid, structure, multi-body dynamics and beyond. The multi-physics library is based on a unique and unified computational framework by which strong coupling has been achieved for all involved physics.
Netgen/NGSolve is a high performance multiphysics finite element software. It is widely used to analyze models from solid mechanics, fluid dynamics and electromagnetics. Due to its flexible Python interface new physical equations and solution algorithms can be implemented easily.