proteus VSM Alternatives

It is a circuit simulator on a virtual breadboard.

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.

MyOpenLab is a platform for finished elements (program components) that can be linked together.

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

A Cross Platform and Open Source Electronics Design Automation Suite

Animated electronic circuit simulator using ideal components to visualize voltage and current.

Qucs-S is a spin-off of the Qucs cross-platform circuit simulator.

an emulator for the Arduino platform by Greg Hewgill

Xcos is a graphical editor to design hybrid dynamical systems models.

Ngspice is a mixed-level/mixed-signal circuit simulator.

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

Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...