テンプレート 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!
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Fancy frames template
Template for creating books with fancy frames
Mozalbete

fancyBook - designEditorial
The template fancyBook is a package for TeXLive 2019. its focus is that you can create books in a clean and fast way with options to install new themes or change it easily. More info http://losacademycos.com/design-academycos10-1/fancybook-template/
losacademycos.com - Camilo Riveros

A book cover template - A dust jacket
This book cover template is written with the bookcover LaTeX document class.
Tibor Tómács

Template for typesetting science fiction and fantasy books
This template is for typesetting science fiction/fantasy manuscripts using the sffms LaTeX class.
For further information, visit CTAN: https://www.ctan.org/tex-archive/macros/latex/contrib/sffms.
This template was originally published on ShareLaTeX and subsequently moved to Overleaf in November 2019.
Upoaded from ShareLaTeX

Simple book template (5.5 x 8.5 inches)
A simple LaTeX template for a book of 5.5 × 8.5 inches (half Letter dimension). Created by Suresh Emre.
This template was originally published on ShareLaTeX and subsequently moved to Overleaf in November 2019.
Uploaded from ShareLaTeX

Book template using the ClassicThesis package
Example book template based on “A Classic Thesis Style” (created by Andre Miede).
See also: http://www.ctan.org/tex-archive/macros/latex/contrib/classicthesis/.
This template was originally published on ShareLaTeX and subsequently moved to Overleaf in November 2019.
Uploaded from ShareLaTeX

Simple A5 book template
A simple LaTeX template for an A5 book in German, created by Michael Muller.
Source: https://github.com/cmichi/latex-template-collection.
This template was originally published on ShareLaTeX and subsequently moved to Overleaf in November 2019.
Uploaded from ShareLaTeX

LaTeX ePub / eBook Template
This document shows how you can get ePub/eBook-like formatting in LaTeX with the memoir document class. You can't yet export directly to ePub from writeLaTeX, but you can export to PDF. To get ePub, you can download the LaTeX source from writeLaTeX and run it through a format conversion tool, such as htlatex to get HTML, and then go from HTML to ePub with a tool like Sigil or Calibre. See this thread on Stack Overflow for more advice.
writeLaTeX

ILM Report
A template designed for use with the Institute of Leadership and Management (ILM) submissions, but could be modified for other uses such as project reports. A bright, coloured report with plenty of images, formal, but also good looking. (Created based on the Legrand Orange Book template.)
Jenny Lantair