Altair Activate is described as 'Software is an open & flexible tool for rapidly modeling and simulating products as multi-disciplinary systems in the form of 1D models (expressed as signal-based or physical block diagrams), optionally coupled to 3D models' and is an app. There are four alternatives to Altair Activate for Mac, Windows, Linux, Web-based and Chrome OS. The best Altair Activate alternative is Simulink. It's not free, so if you're looking for a free alternative, you could try OpenModelica or JModelica.
Simulink® is a block diagram environment for multidomain simulation and Model-Based Design. It supports simulation, automatic code generation, and continuous test and verification of embedded systems.
OpenModelica – A Free Modelica Environment! OpenModelica is an open-source Modelica-based modeling and simulation environment intended for industrial and academic usage. Its long-term development is supported by a non-profit organization – the Open Source Modelica Consortium (OS.
JModelica is an extensible Modelica-based open-source platform for optimization, simulation, and analysis of complex dynamic systems.
StochSD (Stochastic System Dynamics) is a System Dynamics simulation software with focus on stochastics. It is a form of Continuous System Simulation (CSS) that in addition to model and simulate continuous flows between compartments, can handle transitions of discrete entities.
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