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.
LaTeX is a high-quality typesetting system; it includes features designed for the production of technical and scientific documentation. LaTeX is the de facto standard for the communication and publication of scientific documents.