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DSpice: Design and Simulation of Circuits using Spice
...DSpice (Designing Circuits and Simulation by SPICE) is an open-source tool designed to streamline the modeling of analog components and the simulation of electronic circuits. It leverages ngspice (the open-source successor to the classic SPICE engine) as its core simulation backend. The main objectives and features of DSpice are:
. Custom Modeling: Creating new SPICE models for various electrical components.
. Symbol Design: Designing and managing custom schematic symbols for these models.
. Schematic Capture: Drawing and designing circuits using an intuitive CAD-style schematic editor.
. ...
Pipes is a desktop system which analyzes an AutoCad(TM) drawing of a sprinkler system, checks for flaws and after these are eliminated, adds the size/diameter labels to the drawing. Tutorial: http://users.norwoodlight.com/janh/wink/autopipes-entry.htm