Added information about replacements for pspice ~pspice.org~.
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+#+TITLE: Replacements for pSpice
+#+AUTHOR: Anoop Jacob Thomas
+#+EMAIL: info@fossee.in
+#+DATE: 2011-05-10 Tue
+#+DESCRIPTION:
+#+KEYWORDS:
+#+LANGUAGE: en
+#+OPTIONS: H:3 num:nil toc:t \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
+#+OPTIONS: TeX:t LaTeX:t skip:nil d:nil todo:t pri:nil tags:not-in-toc email:nil author:nil timestamp:nil creator:nil
+#+INFOJS_OPT: view:t home:software.html toc:nil ltoc:t mouse:underline buttons:0 path:http://orgmode.org/org-info.js
+#+EXPORT_SELECT_TAGS: export
+#+EXPORT_EXCLUDE_TAGS: noexport
+#+LINK_UP:
+#+LINK_HOME:
+#+XSLT:
+
+* NGSpice
+
+** About NGSpice
+
+Ngspice is a mixed-level/mixed-signal circuit simulator. Its code is
+based on three open source software packages: Spice3f5, Cider1b1 and
+Xspice. Ngspice is part of gEDA project, a full GPL'd suite of
+Electronic Design Automation tools.
+
+Spice3 does not need any introduction, is the most popular circuit
+simulator. In over 30 years of its life Spice3 has become a de-facto
+standard for simulating circuits.
+
+Cider couples Spice3f5 circuit level simulator to DSIM device
+simulator to provide greater simulation accuracy of critical
+devices. DSIM devices are described in terms of their structures and
+materials.
+
+Xspice is an extension to Spice3C1 that provides code modeling support
+and simulation of digital components through an embedded event driven
+algorithm.
+
+** List of Courses/Subjects/Areas where NGSpice used
+ - Electronics Circuit Simulator
+ - Microelectronics
+ - Electronics Circuit Analysis and Design
+ - Analog Integrated Circuits
+ - Digital Electronics and Circuits
+
+** Learning Resources for NGspice
+
+ - User Manual: http://ngspice.sourceforge.net/docs.html
+ - Spoken Tutorials: http://spoken-tutorial.org (Coming Soon)
+
+** Where NGspice used/NGspice Support
+
+ - Indian Institute of Technology, Bombay