Based on Berkeley's Spice Version 3f5.
Ng-spice is part of the gEDA Project.
*The actual version of NG-SPICE is still covered by the original spice license, we are rewriting the code to make it GPL.
There is a lot of documentation that can be useful for developing a circuit simulator based on spice3 and there will be a lot of documentation about ng-spice itself. The documents on this page contains detailed technical information and are provided as an help for ng-spice developers. Documents are grouped by area of interest, some of them are freely distributable and can be downloaded from this server, while others are copyright protected and available only through copyright holders. Papers are copyright protected material and cannot be downloaded from here.
Documents available through the Internet appears in the links section.
DEVICES AND DEVICES
DEVICES AND DEVICES MODELING