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

Fig Control
Code using schemabloc
Fabian León

Kieran Healy's CV Template
A template to produce a nice-looking Curriculum Vitae.
Most recent version is at http://kjhealy.github.com/kjh-vita.
(This template has been modified to use fonts available on Overleaf.)
Kieran Healy (uploaded by LianTze Lim)

Drawing coloured boxes using tcolorbox
The package provides an environment for coloured and framed text boxes with a heading line. Optionally, such a box may be split in an upper and a lower part; thus the package may be used for the setting of LaTeX examples where one part of the box displays the source code and the other part shows the output. Another common use case is the setting of theorems. The package supports saving and reuse of source code and text parts.
Thomas F. Sturm (uploaded by LianTze Lim)

Don't stare at this one for too long
Submitted as an answer to the Showcase of Optical Illusions question on TeX SX.
Click the Illusions tag below to see more!
Andrew Kepert

Generate IEEE Styled Bibliography for all kinds of items
This is a skeleton file to create IEEE style Bibliography list. There is a guide added "create-manual-bib-entry.txt" to manually create popular types of references such as PhD thesis, website, unpublished work etc.
Modified by K. Reaz( kahn.reaz@ieee.org)
Support sites:
http://www.ieee.org/
Khan Reaz

Filter Overview
continuous and discrete transfer functions for low pass, high pass, band pass and band stop filters
Mirko Kunze

Homework Template - Methods of Applied Mathematics Problem Set 1
homework template
Qi Lei

Stat/Discrete Methods for Sci Computing Problem Set 1
Short Sectioned Assignment
LaTeX Template
Version 1.0 (5/5/12)
This template has been downloaded from:
http://www.LaTeXTemplates.com
Original author:
Frits Wenneker (http://www.howtotex.com)
License:
CC BY-NC-SA 3.0 (http://creativecommons.org/licenses/by-nc-sa/3.0/)
Qi Lei

Is There Enough Potentially Available Renewable Energy to Meet The Needs of the Current Population of the Planet Earth?
An article usually includes an abstract, a concise summary of the work covered at length in the main body of the article.
Eloise Richer