Jim Hefferon
A brief overview of the Asymptote language for drawing mathematical graphics.
Consistent text and maths using concrete fonts.
Make plain text safe for use in LaTeX.
A document for absolute LaTeX beginners.
A short list of go-to LaTeX packages, aimed at a beginner.
Unofficial reference manual covering LaTeX2ε.
A direction-finder for LaTeX resources available online.
Theorem environments that are shaded.
Make a web page to compare styles.
LaTeX Math for Undergraduates cheat sheet.
Creating Venn diagrams with METAPOST.