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+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.
+
+Ngspice is, anyway, a little more than the simple sum of the packages
+above, as many people contributed to the project with their
+experience, their bug fixes and their improvements. If you are
+interested, browse the site and discover what ngspice offers and what
+needs. If you think you can help, join the development team.
+
+Ngspice is an ongoing project, growing everyday from users
+contributions, suggestions and reports. What we will be able to do
+depends mostly on user interests, contributions and feedback.