So far my pick is QucsStudio for Qucs like simulators and LTspice for Spice like simulators. Components models and libraries seems different between Spice and Qucsator engines. If you ever need to convert between DWG, DXF, GDS. For non RF simulations, LTspice is easier to operate and have more parts models when in comparison with Qucs or TINA-TI. Qucs and QucsStudio (see above) also perform Spice analysis. microstrip simulation, filters design, Smith charts, etc. QucsStudio has the best GUI, a good set of video tutorials, and what I like most, it has live Sliders (called Tune), look how awesome this feature is (at minute 3:55)! - All Qucs versions have some nice RF goodies e.g. Just unzip and run bin/qucs.exe with WINE on Linux, or run the start.bat for Windows. QucsStudio (IMO this is the best Qucs) - has the look of QUCS, it is released as a portable version for Windows only, but it works just fine in Linux with Wine and it is all built with GNU components, but compiled for Windows/MinGW only. Besides Qucs-S, ngspice must also be installed. Usually not in the Linux repositories, has to be compiled or installed manually. For example, using an Agilent ADS or Hyperlynx LineSim instead of the QUCS would give a more realistic Z(f) curve without the noise caused by computation. Qucs-S (Qucs with Spice) - has the look of QUCS, but the simulation engine is based on SPICE, more precise 'ngspice'. QUCS (Quite Universal Circuit Simulator) - is the one usually found in Linux repositories, and the simulation engine is based on Qucsator, it is not based on SPICE 2. They are all simulators for electronic circuits, just like LTspice or TINA-TI, but different.
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