Qucs-S is a circuit simulation program based on Qucs circuit simulator. The "S" letter indicates SPICE. The purpose of the Qucs-S project is to use free SPICE circuit simulation kernels with the GUI based on Qt toolkit. It merges the power of SPICE and the simplicity of the Qucs GUI. Qucs-S is not a simulator by itself, but it requires to use an external simulation backend with it. Qucs-S allows to use the following open-source simulation kernels: Ngspice is recommended to use. Ngspice is powe
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 (OSMC). An overview journal paper is available and slides about Modelica and OpenModelica. The goal with the OpenModelica effort is to create a comprehensive Open Source Modelica modeling, compilation and simulation environment based on free software distributed in b
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