20-sim Alternatives

Altair Activate 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.

A high-level language and interactive environment for numerical computation, visualization, and programming

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Xcos is a graphical editor to design hybrid dynamical systems models.

DWSIM is an open-source CAPE-OPEN compliant chemical process simulator for Windows and Linux.

GNU Octave is a programming language for scientific computing.

OpenModelica – A Free Modelica Environment!

Calculation Laboratory is an online environment for numerical computations.

Reinteract is a system for interactive experimentation with Python

COCO (CAPE-OPEN to CAPE-OPEN) is a free-of-charge CAPE-OPEN compliant steady-state simulation...

LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.

MapleSim is an advanced system-level modeling tool that enables innovation and reduces development risk.

Maximize profits using a plant-wide simulation solution that combines unparalleled accuracy and engineering collaboration with time-saving workflows.

Documentation has been migrated to doxygen. A number of improvements have been made to the JIT back end. 64-bit on all platforms! It's not a long list, but given the nearly 2 years since the last release, 4.