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Multilingual document with babel and lualatex
A sample of a multilingual document (Arabic, Greek, Hebrew, Japanese, Serbian, etc.) created with babel and lualatex.
See also the following resources:
Multilingual typesetting on Overleaf using babel and fontspec (XeLaTeX and LuaLaTeX)
Gallery example here
Multilingual typesetting on Overleaf using polyglossia and fontspec (XeLaTeX and LuaLaTeX)
Gallery example here
Javier Bezos

Easy Greek and Russian Multi-Lingual Example
sample of Greek with pdflatex instead of xelatex
David Derbes - U. Chicago Laboratory Schools

Example: Greek and English text
Example: Greek and English text
WriteLaTeX

How to Write Multilingual Text with Different Scripts in LaTeX on Overleaf using Polyglossia
A multilingual example document with Arabic, Sanskrit, Hindi, Chinese, Japanese, Korean, Greek and Thai, using XeLaTeX + fontspec + polyglossia.
LianTze Lim

Πρότυπο Πτυχιακής Εργασίας - Τμήμα Μηχανικών Πληροφορικής Τ.Ε. - ΤΕΙ Πελοποννήσου
(το πρότυπο αποτελεί προσαρμογή του προτύπου διπλωματικής εργασίας της Σχολής Ηλεκτρολόγων Μηχανικών και Μηχανικών Η/Υ του ΕΜΠ - [http://web.dbnet.ntua.gr/el/diplomas.html])
John Liaperdos