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

Using PSTricks with pdflatex on Overleaf
PSTricks drawings can't be compiled under pdflatex and lualatex (Frequently done errors #5). Instead, compilation with XeLaTeX is preferred if you need to use .jpg/.png/.pdf images in your project.
But if you absolutely need to compile with pdflatex, this example demonstrates how to use PStricks with pdflatex using auto-pst-pdf on Overleaf (But you still can't use .jpg/.png/.pdf images within your PSTricks drawings).
Overleaf

Flag of the Marshall Islands
Flag of the Republic of the Marshall Islands, according to official government specifications
Senan Sekhon

The gridpapers package (v1.0.2)
This is a simple example showing how to use the gridpapers package. You can report bugs, get the code, and see usage instructions here:
https://github.com/mcnees/LaTeX-Graph-Paper
Robert McNees, Leo Stein

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

Perpetual Calendar
A cut-out template for a circular calendar that can be used indefinitely.
Senan Sekhon

MWE: Diluição da rede
Exemplo de representação da diluição da rede quadrada com o pacote pstricks.
Guilherme Wiener

A longtable example
An example using the longtable environment to create tables that span multiple pages.
Overleaf

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

Statistics Formula Sheet
Formula sheet for a statistics course
Elizabeth McDonald