Instead of OpenFOAM
OpenFOAM alternatives
OpenFOAM is a free, GPL-licensed toolbox for computational fluid dynamics. It simulates fluid flow, heat transfer, and related physical processes, with tools for preparing models, generating meshes, solving multiple flow and physics problems, and reviewing results. Built-in mesh tools include blockMesh and snappyHexMesh; it can also convert meshes from external formats. ParaView integration supports visualization, and the software runs on Linux, macOS, Windows, and self-hosted setups. Its current release introduces GPU offloading as a compile-time option, with GPU work on a separate development track.
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OpenSim
Free plan APILinuxMac+1Modeling human, animal, or robot movement — OpenSim models movement and interactions among humans, animals, robots, and environments rather than focusing on fluid flow and heat transfer.
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ngspice
Free plan LinuxMacSelf-hosted+1Analog, digital, and mixed-signal circuit simulation — ngspice simulates netlist-described electric circuits and supports SPICE models, instead of OpenFOAM’s fluid and heat-transfer simulations.
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GNU FisicaLab
Free plan LinuxWindowsEducational physics problem solving — FisicaLab focuses on solving educational physics problems, including mechanics and thermodynamics, rather than computational fluid dynamics.
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FeenoX
Free plan APILinuxSelf-hosted+1Open-source multiphysics with text-based inputs — FeenoX uses English-like plain-text input files and is free and open source, while OpenFOAM centers on CFD workflows.
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Step
Free plan LinuxInteractive two-dimensional physics exploration — Step is a Linux-only interactive simulator for 2D mechanics, molecular dynamics, sound waves, and deformable bodies rather than CFD.
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PySDM
Free plan LinuxSelf-hosted - 13
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libCEED
Free plan APILinuxSelf-hosted - 15
LISE++
Free plan LinuxMacWindows - 16
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VaMPy
Free plan LinuxMacSelf-hosted+1 - 18
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FDTDX
Free plan LinuxSelf-hosted - 21
PySWMM
Free plan LinuxMacWindows - 22
Physics Classroom Physics Interactives
Free plan AndroidiPhoneWeb - 23
pyuvsim
Free plan LinuxMacWindows - 24
PyAutoLens
Free plan LinuxMacWindows
Readers may look elsewhere when their work is not CFD, or when they need a different modeling workflow or support arrangement. OpenFOAM costs nothing, but support and code customization are separate services with annual hour limits; there is no free trial, and OpenCFD says it does not respond to support queries without a support package. Compare each option’s subject matter, authoring approach, platforms, visualization and export capabilities, and price. OpenSim targets movement, ngspice targets circuits, and other options focus on dynamical systems or physics education, so their suitability depends on the problem being modeled.
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