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Drawing Pie Charts with pgf-pie
pgf-pie is a LaTeX package for drawing pie charts (and some interesting variants on pie charts) with the PGF/TikZ graphics package.
The examples in this document are from the pgf-pie manual, version 0.2.
The source code for pgf-pie is available at http://code.google.com/p/pgf-pie/.
Yuan Xu

Figures TikZ du cours "Fluides parfaits
Ce document regroupe les codes TIKZ des figures utilisées pour le cours "DYNAMIQUE DES FUIDES PARFAITS" situé à la page http://femto-physique.fr/mecanique_des_fluides/mecaflu_C2.php
J. Roussel

Figures TikZ du cours "PROBLEMES E CHUTE"
Ce document regroupe les codes TIKZ des figures utilisées pour le cours "PROBLEMES DE CHUTE" situé à la page
http://femto-physique.fr/mecanique/meca_C3.php
Jimmy Roussel

Figures TikZ du cours "Interaction électrostatique"
Ce document regroupe les codes TIKZ des figures utilisées pour le cours "Interaction électrostatique" situé à la page http://femto-physique.fr/electromagnetisme/interaction_electrostatique.php
Jimmy Roussel

unit-Circle
My spin on the unit circle.
Michael McCabe

Periodic Pool Table
A billiards-themed periodic table, made with TikZ
Senan Sekhon

Flag of the United States
Flag of the United States of America, according to official government specifications
Senan Sekhon

LaTeX Coffee Stains
This package provides an essential feature to LaTeX that has been missing for too long. It adds a coffee stain to your documents. A lot of time can be saved by printing stains directly on the page rather than adding it manually. You can choose from four different stain types.
Hanno Rein, Evan Sultanik, Luis Randez, Adrian Robson

Tikz airplane picture
Vectorized into eps by potrace, converted into metapost by pstoedit, manually edited into a tikz picture, cleaned up a bit.
Source: https://github.com/lahvak/TeX-stuff/blob/master/plane.tex
lahvak