Examples of powerful LaTeX packages and techniques in use — a great way to learn LaTeX by example. Search or browse below.

Example Matrix usage
Spanish homework of precepts for Linear Algebra
Vago sin Voz

Title page with logo
University Assignment Title Page
LaTeX Template
Version 1.0 (27/12/12)
This template has been downloaded from:
http://www.LaTeXTemplates.com
Original author:
WikiBooks (http://en.wikibooks.org/wiki/LaTeX/Title_Creation)
License:
CC BY-NC-SA 3.0 (http://creativecommons.org/licenses/by-nc-sa/3.0/)
Instructions for using this template:
This title page is capable of being compiled as is. This is not useful for
including it in another document. To do this, you have two options:
1) Copy/paste everything between \begin{document} and \end{document}
starting at \begin{titlepage} and paste this into another LaTeX file where you
want your title page.
OR
2) Remove everything outside the \begin{titlepage} and \end{titlepage} and
move this file to the same directory as the LaTeX file you wish to add it to.
Then add \input{./title_page_1.tex} to your LaTeX file where you want your
title page.
\title{Title page with logo}
Wendy Halfar

Lua\LaTeX
Erste Schritte mit LuaLaTeX
Pseudozufallszahlen und einfache Rechnungen mit Lua; Ausgabe mit LaTeX
Werner Pronkow

Πρότυπο Πτυχιακής Εργασίας - Τμήμα Μηχανικών Πληροφορικής Τ.Ε. - ΤΕΙ Πελοποννήσου
(το πρότυπο αποτελεί προσαρμογή του προτύπου διπλωματικής εργασίας της Σχολής Ηλεκτρολόγων Μηχανικών και Μηχανικών Η/Υ του ΕΜΠ - [http://web.dbnet.ntua.gr/el/diplomas.html])
John Liaperdos

ตัวอย่างการใช้ UTF-8
This example shows how to set up the thailatex package to write in Thai and several other languages using UTF-8 encoding and the babel package. The thailatex package lets you use the standard latex document classes, such as article to write texts in the Thai language.
Theppitak Karoonboonyanan

Figures TikZ du complément "Les coniques"
Codes TikZ des figures présents sur le cours "Les coniques" accessible à l'adresse :
http://www.femto-physique.fr/mecanique/meca_complement2.php
Jimmy Roussel

Restaruant Menu
An example Menu for a Restaurant
Based on an menu on tex.sx with some modifications.
Ingemar Grahn

qobitree -- pakietomat.wordpress.com
Pakiet umożliwia robienie prostych grafów. Jest prosty i efektowny w działaniu. Kolejne polecenia \leaf umieszczają na stosie swoje parametry, a polecenia \branch zdejmują ze stosu wskazaną pierwszym argumentem liczbę obiektów i łączą je ukośnymi liniami; graf jest budowany w odwrotnej kolejności.
pakietomat.wordpress.com

Family Tree
Family Tree table, Genealogy
Hermann Schirmacher