Scilab is recommended for engineers, scientists, and educators who require a powerful computational tool without the associated costs of commercial software. It is also suitable for students and researchers who are looking to perform complex mathematical modeling and simulations.
LTspice is highly recommended for electronics engineers, students, and hobbyists who are involved in the design and analysis of analog circuits. It is especially beneficial for those working with power electronics, filter design, and analog components, as well as educators who require a dependable tool for teaching circuit fundamentals.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.
QUCS - Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit.
GNU Octave - GNU Octave is a programming language for scientific computing.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...