EDMAC is a program written as a set of plain TeX macros for formatting complex critical editions. You mark up your text and notes using the tags provided by EDMAC, and then TeX will create a beautiful book for you with the text line numbered, lemmata referred to by line-number, up to six layers of notes at the bottom of the page (variants, testimonia, etc.), as well as up to six sets of notes sent to appendices. It is also possible to control the layout of each layer of notes separately: single column, two- or three-column, paragraphed, etc.
This section is devoted to a template bundle which I developed for the typesetting system LaTeX. The first version of the template was released in early 2006. From the feedback and postcards I received so far, it seems to be in heavy use all over the world!