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SimFlow is a powerful CFD software, focused on engineering and science.
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OpenModelica โ A Free Modelica Environment!
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Qucs-S is a spin-off of the Qucs cross-platform circuit simulator.
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CircuitVerse is an online community driven platform to design and simulate digital logic circuits.
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A minimalistic digital logic simulator.
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Design & simulate gates & PLAs with transistors & diodes, Processors with integrated logic components, using std_logic signals. Easy to wire buses, reverse polarity of discrete parts, or change parts to open collector. Even apply DeMorgan on gates!.