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.

DWSIM - DWSIM is an open-source CAPE-OPEN compliant chemical process simulator for Windows and Linux.

LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.

MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming

PyLab_Works - PyLab_Works is a free and open source replacement for LabView + MatLab, written in pure Python.

CHEMCAD - We equip chemical engineers with integrated and intuitive process simulation software to tackle projects large and small. Discover how CHEMCAD can help you design, analyze and measure simple and complex processes like never before.