Ngspice is the name of a project and of a program in the project.  Spice is
the famous circuit simulator developed by the CAD Group of the University of
California at Berkeley (UCB). The NG prefix has a lot of meanings: Next
Generation, New Good, etc. Choose or invent the one you prefer. The ngspice
project aims to improve the capabilities of the Spice3 circuit simulator. The
heart of the project is the ngspice program, a circuit simulator derived from
spice3f5.

WWW: http://ngspice.sourceforge.net/
