CTAN has a new package: bodegraph

[CTAN Announcements]

This should be at your local mirror.

Jim Hef{}feron
Saint Michael's College

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The following information was provided by our fellow contributor:

Name of contribution: BodeGraph with Tikz
Version number: 1.4
Author's name: Papanicola Robert
Summary description: This package allows you to draw the Bode plots, Nyquist, and Black 
  using Gnuplot and Tikz.
License type: lppl

Announcement text: 
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Ce package permet de tracer les diagrammes de Bode, Black et Nyquist à l’aide de 
Gnuplot et Tikz. Les fonctions de transfert élémentaires et les correcteurs courants 
sont préprogrammés pour être utilisés dans les fonctions de tracé.

This package allows you to draw the Bode plots, Nyquist, and Black using Gnuplot 
and Tikz. Elementary Functions Transfer and basics correctors are preprogrammed
to be used.
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This package is at 
   http://tug.ctan.org/tex-archive/graphics/pgf/contrib/bodegraph
.  Information is at
   http://tug.ctan.org/pkg/bodegraph
(it may take a day for the information to appear).  We are supported 
by the TeX Users Group http://www.tug.org .  For your users group 
see http://www.tug.org/usergroups.html .