The Little Redis Book is a free book introducing Redis.
The book was written by Karl Seguin, with Perry Neal's assistance.
If you liked this book, maybe you'll also like The Little MongoDB Book.
The book is freely distributed under the Attribution-NonCommercial 3.0 Unported license.
The book is written in markdown and converted to PDF using PanDoc. A few LaTex specific commands have been placed in the markdown file to help with pdf-generation (namely for the title page and to create page breaks between chapters).
Kindle and ePub format provided using PanDoc.
I use a variation of https://github.com/claes/pandoc-templates to generate the pdf:
#!/bin/sh
paper=a4paper
hmargin=3cm
vmargin=3cm
fontsize=11pt
mainfont=Verdana
sansfont=Tahoma
monofont="Courier New"
columns=onecolumn
geometry=portrait
nohyphenation=true
markdown2pdf --xetex --template=template/xetex.template \
-V paper=$paper -V hmargin=$hmargin -V vmargin=$vmargin \
-V mainfont="$mainfont" -V sansfont="$sansfont" -V monofont="$monofont" \
-V geometry=$geometry -V columns=$columns -V fontsize=$fontsize \
-V nohyphenation=$nohyphenation en/redis.md -o redis.pdf
A PSD of the title image is included. The font used is Comfortaa.