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

Quadratic Function
A leaflet created for a Math class that I conduct during this term.
Maciej

Creating an index with the makeidx package
This is a short example to show how the \makeindex and \printindex commands can be used to create and display a document index.
Example originally from http://www.dickimaw-books.com/latex/thesis/html/makeidx.html
A modification of this example by John Hammersley

Listings Code Style for HTML5 (CSS, HTML, JavaScript)
This example shows how to use the listings package to syntax highlight code in LaTeX. It highlights multiple languages: CSS, HTML and JavaScript.
This example is being developed collaboratively in response to this question on the TeX StackExchange. Improvements welcome!
Benny Neugebauer and the TeX StackExchange Community

Paraboloid in LaTeX with TikZ
Trying to draw a paraboloid.
Adi

Footnote Citations with Biblatex
This example shows how to create citations in footnotes using biblatex. Biblatex automatically formats references and citations, much like BibTeX, but biblatex is more robust and more powerful. You can (almost certainly) use your existing .bib databases with biblatex, it comes with a wide variety of styles built in, and it's much easier to write your own custom styles.
In this example, we use the verbose-ibid style to generate footnotes with automatic “ibid.” abbreviations. For a full list of styles, see the user guide in the biblatex manual.
writeLaTeX

Using Jurabib for Oxford style footcite with the normal cite command
For creating a humanities style for references, this short example shows how to cite by the Oxford method with footnotes, and with titles in italics.
Andreas Sjostedt

Hello World Example
This is the very simple example of a 'Hello, World!' document in LaTeX, from video #1 in the LaTeX video tutorial series by Dr Vincent Knight.
Dr Vincent Knight

Ejemplo de uso de condicionales para definir un nuevo Macro
Esta es un ejemplo de cómo utilizar casos condicionales para evaluar
las diferentes opciones de un parámetro de entrada en un nuevo macro
personalizado, en este ejemplo se condiciona el tipo intervalo que se
representa de acuerdo a si se trata de un intervalo infinito o no y
si es abierto o cerrado.
2017 por Fausto M. Lagos S. <piratax007@protonmail.ch>
Este trabajo puede ser distribuido o modificado bajo los
términos y condiciones de la LaTeX Project Public License (LPPL) v1.3C,
o cualquier versión posterior. La última versión de esta licencia
puede verse en:
http://www.latex-project.org/lppl.txt
Usted es libre de usarlo, modificarlo o distribuirlo siempre que se
respeten los términos de la licencia y se reconozca al autor original
Fausto Mauricio Lagos Suárez

Track Changes in LaTeX with trackchanges
Note: TrackChanges is not part of TeX Live, and hasn't been updated in a while. Instead, changes.sty, a package for the same purpose, is available in TeX Live and more recent. You can find the example template here.
TrackChanges is a package for collaboratively editing LaTeX documents which allows multiple editors to make changes & add annotations to a document.
Here we present a short example of it's use, which you can use as a template to get started.
writeLaTeX