Thomas F. Sturm
Simple CSV file processing.
Fixed-point arithmetic with two decimal places.
Pedigree and genealogical tree diagrams.
Sophisticated graphics inclusion in a PDF document.
Spherical Mercator coordinate systems and Web Mercator tile integration.
Sanitize umlauts for MakeIndex and pdfLaTeX.
Coloured boxes, for LaTeX examples and theorems, etc..
TikZ libraries for filling with images and patterns.