SNAP (software)
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SNAP (Symbolic Network Analysis Program) is a symbolic circuit simulator for the Windows environment. Unlike more common numerical circuit simulators (such as SPICE), SNAP can generate analytical Laplace domain expressions for arbitrary network functions of linear analog circuits. The SNAP package also includes tools for schematic capture and graphic post-processing as well as advanced features such as Parameter Stepping, a Dependences Editor and the ability to export results to various, analysis software.
SNAP is available for free from its homepage (see External links).