“Text and document processing tools through the use of
typesetting languages are especially popular for the creation of
large documents such as books.”
“… most Linux installations have powerful document processing
tools already installed.”
“TeX is a typesetting system intended for the creation of books,
particularly ones that contain mathematics.”
“Much like TeX, groff can create documents and books. One
feature of Groff that is missing from TeX, though, is the ability
to create ASCII plain-text output.”
“SGML (Standard Generalised Markup Language) is the king of
markup languages.”