The best free alternative to Simulink is Circuit Simulator, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Simulink and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Simulink are Xcos (Free, Open Source), OpenModelica (Free, Open Source), GNU Radio (Free, Open Source) and Minsky (Free, Open Source).
Minsky enables the simulation of models (particularly from economics) defined in terms of coupled ordinary differential equations. The models are defined using a drawing canvas (rather like VisSim), and a double entry bookkeeping system known as a Godley table.
Physical things are great. Hardware companies like Apple, Arduino, etc are disrupting our lives in a big way. At BrainBox we love hardware hackers and are in absolute awe of their awesome design and applications they build.
Block model simulator for python BMS is a block model time simulator: it computes time values of time functions (called variables) linked by blocks which represent equations and behaviors between them.
Altair Activate 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.
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Altair Activate vs Simulink opinions
pros, cons and recent comments
Altair Activate is able to import .mdl and .slx files developed at simulink, this feature help to migrate from simulink to Activate. For now I believe this is the first software able to do that.
Explore powerful simulation algorithms for System Dynamics and Agent Based Modeling in a truly cohesive environment. Use System Dynamics to gain insights into your system. Use Agent Based Modeling to granularly break apart the details.