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Components models and libraries seems different between Spice and Qucsator engines. For non RF simulations, LTspice is easier to operate and have more parts models when in comparison with Qucs or TINA-TI. 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. transient analysis (including periodic steady-state simulation). small signal S parameter circuit analysis, time domain transient analysis and VHDL/Verilog.
QUCS TRANSIENT SIMULATION TUTORIAL PORTABLE
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. QucsStudio is mainly a circuit simulator that has evolved out of the project Qucs. 2 Getting Started with Qucs Analogue Circuit Simulation. Besides Qucs-S, ngspice must also be installed. There are more than 25 alternatives to QUCS for a. Qucs-S (Qucs with Spice) - has the look of QUCS, but the simulation engine is based on SPICE, more precise 'ngspice'. QUCS is described as 'The Quite Universal Circuit Simulator (QUCS) is an integrated circuit simulator allowing the simulation and graphical presentation of results of large-signal, small-signal and noise behavior in circuits' and is a circuit simulator in the education & reference category. 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.
