eSim

eSim (formerly known as Oscad/FreeEDA) is an open source EDA tool for circuit design, simulation, analysis and PCB design, developed by the FOSSEE team at IIT Bombay.

Using open source software, such as KiCad, Ngspice, Python and Scilab, we have built an integrated open source EDA tool, eSim. One may draw a circuit using KiCad, create a netlist and simulate using Ngspice. One may also do PCB design and generate Gerber files. One may add models and subcircuits. One may also generate differential equations of analog circuits and solve them through Scilab. eSim runs on Ubuntu Linux and a few flavours of Windows (XP and 7, at present).

A book that explains the use of this software is also made available. The resources (e-book, eSim software, examples and the Spoken Tutorials) are all available for free download from the website.