
Scilab - free open-source software for numerical computation and simulation similar to MATLAB/Simulink. SageMath - a system for algebra and geometry experimentation via Python. Repast - agent-based modeling and simulation platform with versions for individual workstations and high performance computer clusters. Project Chrono - an open-source multi-physics simulation framework. Physics Abstraction Layer - an open-source physics simulation package. OpenSim - an open-source software system for biomechanical modeling. Open Source Physics - an open-source Java software project for teaching and studying physics. OpenModelica - an open source modeling environment based on Modelica the open standard for modeling software. OpenFOAM - open-source software used for computational fluid dynamics (or CFD). ns-3 - an open-source network simulator. NetLogo - an open-source multi-agent simulation software. NEST - open-source software for spiking neural network models. Mobility Testbed - an open-source multi-agent simulation testbed for transport coordination algorithms. is a free and open source software platform based on the Modelica modeling language. iMODELER - free web based qualitative modeling software and expert system for business, education, and public policy applications. HASH - open-core multi-agent simulation software and package manager. GNU Octave - an open-source mathematical modeling and simulation software very similar to using the same language as MATLAB and Freemat. Gekko - simulation software in Python with machine learning and optimization. Freemat - a free environment for rapid engineering, scientific prototyping and data processing using the same language as MATLAB and GNU Octave.
FreeFem++ - Free, open-source, multiphysics Finite Element Analysis (FEA) software.
FlightGear - a free, open-source atmospheric and orbital flight simulator with a flight dynamics engine (JSBSim) that is used in a 2015 NASA benchmark to judge new simulation code to space industry standards.Facsimile - a free, open-source discrete-event simulation library.
Elmer - an open-source multiphysical simulation software for Windows/Mac/Linux.DWSIM - an open-source CAPE-OPEN compliant chemical process simulator.CP2K - Open-source ab-initio molecular dynamics program.ASCEND - open-source equation-based modelling environment.Algodoo - 2D physics simulator focused on the education market that is popular with younger users.Advanced Simulation Library - open-source hardware accelerated multiphysics simulation software.