Tikz

This is a comprehensive reference for drawing diagrams programmatically in LaTeX using TikZ/PGF. You get syntax tables for paths, nodes, arrows, and coordinates, plus examples for flowcharts, state machines, trees, and geometric figures. The source covers the essentials like positioning, styling, loops, transformations, and the calc library for coordinate math. It's dense but organized well enough to find what you need when you're halfway through a diagram and can't remember the syntax for curved arrows or node anchors. The manual is famously 1300 pages, so having the common operations extracted like this saves you from hunting through documentation. Good for anyone who needs publication quality diagrams and prefers code over drag and drop editors.