Templates tagged Book
Whether you’re writing fiction or non-fiction, a short story or long textbook, these templates and examples provide a fast and effective way to start composing your latest work. All the required components – such as chapters, sections, title pages, glossaries, acknowledgements -- are set out ready for your content. Just open the template and start writing!

MatNat Compendium
A generic template for large documents written at the Faculty of Mathematics and Natural Sciences at the University of Oslo. Suitable for reports, lecture notes and master's theses.
Documentation for the front page:
https://github.com/martinhelso/mnfrontpage
Useful tips for large documents:
https://github.com/martinhelso/Introduction-to-LaTeX/blob/master/large-documents.md
Martin Helsø

Landscape Book Template
Landscape template for books, includes the code of a collage of portraits.
Ciro Garcia

The Legrand Orange Book Template (English)
The Legrand Orange Book LaTeX Template
Version 2.1.1 (14/2/16)
This template has been downloaded from:
LaTeXTemplates.com
Original author:
Mathias Legrand (legrand.mathias@gmail.com) with modifications by:
Vel (vel@latextemplates.com)
License:
CC BY-NC-SA 3.0
Important note:
Chapter heading images should have a 2:1 width:height ratio,
e.g. 920px width and 460px height.
Mathias Legrand and Vel

Template for Authors to a Springer Contributed Volume
Template for authors contributing chapters to a "contributed volume", provided by Springer, to help structure the manuscript, e.g., define the heading hierarchy. Predefined style formats are available for all the necessary structures that are supposed to be part of the manuscript.Note: These templates are not intended for the preparation of the final page layout! The final layout will be created by Springer according to their layout specifications.
Springer

Manuscript Template for Walter de Gruyter Books and Journals
The dgruyter package assists in preparing manuscripts for de Gruyter
with LaTeX. It provides some special commands for journal papers
as well as for books and generates the required appearance.
Together with corresponding font packages it allows to produce the
final layout of De Gruyter books and journal articles.
Walter de Gruyter GmbH

NIST Handbook Template
Template for NIST author submitting a NIST Handbook.
National Institute of Standards and Technology

Association constitution and rules template
A template I designed for the constitution and rules of an association I'm a part of.
wmcd0298

Fiction Template
A simple template for writing fiction, set up in eBook format. Includes line break and major break macros and a folder of reference files for storing information on characters, plot and setting.
Oz Locke

D&D 5e LaTeX Korean Template
A Korean version of D&D 5e LaTeX Template,
originally created by rpgtex
github repo: https://github.com/ShoyuVanilla/DND-5e-LaTeX-Template-Korean
last updated: Apr 26, 2020
License: The MIT License (MIT)
Shoyu Vanilla