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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.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
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.
upverter - Upverter makes it easy to design and share electronics on the web.
PyLab_Works - PyLab_Works is a free and open source replacement for LabView + MatLab, written in pure Python.
Ktechlab - KTechLab is an IDE for microcontrollers and electronics.