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

LuaTeX: Parsing typeset paragraphs
This example is a LuaTeX-based plain TeX project which implements a LuaTeX callback function to show the components of a typeset paragraph. It is designed to accompany a blog post and, for simplicity, it is not a full-blown “parser”—for example, it is not recursive and ignores a number of node types. However, it offers a useful starting point for anyone wishing to explore callbacks in more detail.
Graham Douglas

Bibliography management: splitting-up a bibliography with BibLaTeX
This example shows how to split your bibliography into different sections using BibLaTeX.
This example was originally published on ShareLaTeX and subsequently moved to Overleaf in November 2019.
Uploaded from ShareLaTeX

Bibliography management: BibTeX example
An example showing how to use BibTeX to manage your bibliography.
This example was originally published on ShareLaTeX and subsequently moved to Overleaf in November 2019.
Uploaded from ShareLateX

Equations For Paper
I want to see if this publishes it in MathML so I can cut & paste from there to other formats.
CK Harnett

Math
Hello! Here's how this works:
You edit the source code here on the left, and the preview on the
right shows you the result within a few seconds.
Bookmark this page and share the URL with your co-authors. They
can edit at the same time!
You can upload figures, bibliographies, custom classes and
styles using the files menu.
This presentation is made with the Beamer package. For tutorials
and more info, see:
http://en.wikipedia.org/wiki/Beamer_(LaTeX)
We're still in beta. Please leave some feedback using the link at
the top left of this page.
Enjoy!
David James

IEEE MTT-S Conference (IMS 2013 example)
With Overleaf, edit online instantly this IEEE MTT-S Conference Paper (IMS 2013), and download a PDF version.
This project is also available on my web site:
Tibault Reveyrand

Cyrillic Fonts: Excerpt from Poems for Akhmatova
A Russian poem demonstrating how to use Cyrillic fonts with UTF-8 encoding and the babel package.
writeLaTeX

Using "import" to facilitate main file in subfolder
Some authors prefer to place their manuscript LaTeX source files in a subfolder, and other research artefacts (figures, tables, etc) in another subfolder. This example shows how this workflow can be maintained on Overleaf, by providing a top-level main.tex that pulls in the real main LaTeX file from the subfolder using the import package.
LianTze Lim

Capa do trabalho
Apenas a capa.
Thales Domingues