This is not an exhaustive list.
TO BE PERIODICALLY UPDATED
Philosophy, Theology & Theurgy Books
“Radical Platonism in Byzantium” by Niketas Siniossoglou
“The works of Emperor Julian Volume I” by Flavius Claudius Iulianus Augustus, translated by Wilmer Cave Wright
“The works of Emperor Julian Volume II” by Flavius Claudius Iulianus Augustus, translated by Wilmer Cave Wright
“The works of Emperor Julian Volume III” by Flavius Claudius Iulianus Augustus, translated by Wilmer Cave Wright
“Living Theurgy: A Course in Iamblichus’ Philosophy, Theology and Theurgy” by Jeffrey S. Kupperman
“Theurgy and the Soul: the Neoplatonism of Iamblichus. Second Ed.” by Gregory Shaw.
“The Complete works of Plato” by Plato, translated by Benjamin Jowett
“The Practical art of Divine Magic: Contemporary & Ancient Techniques of Theurgy” by Patrick Dunn
“On the God and the Cosmos” by Sallustius
“De Mysteriis” by Iamblichus, translated by Emma C. Clarke, John M. Dillon and Jackson P. Hershbell
“De Anima” by Iamblichus, translated by John F. Finamore and John M. Dillon
“Julian’s Gods: Religion and Philosophy in the Thought and Action of Julian the Apostate” by Rowland Smith
“Theurgy in Late Antiquity: the Invention of a Ritual Tradition.” by Ilinca Tanaseanu-Döbler
“Divination and Theurgy in Neoplatonism: Oracles of the Gods” by Crystal Addey
“Aristotle and the Theology of the Living Immortals” by Richard Bodeus, translated by Jan Garrett
“Aristotle and Other Platonists” by L
“The Chaldean Oracles: Text, Translation and Commentary“ by
Hellenism & Ritual Books
“A Companion to Roman Religion (Blackwell Companions to the Ancient World)” by Jörg Rüpke
“Faith, Hope and Worship: Aspects of Religious Mentality in the Ancient World” by H.S. Versnel
“Indo-European Sacred Space: Vedic and Roman Cult” by Roger Woodard
“Introduction to Roman Religion” by John Scheid
“Religions of Rome: Volume 1, A History” by Mary Beard, John North, Simon Price
“Religions of Rome: Volume 2, A Sourcebook” by Mary Beard, John North, Simon Price
“Hellenic Polytheism: Household Worship” by
“Hellenistic Astrology: The Study of Fate and Fortune” by Christopher W. Brennan
“Roman Religion: A Sourcebook” by Valerie M. Warrior
“Greek Religion: A Sourcebook” by Valerie M. Warrior
“Greek Religion” by Walter Burkert
“Kharis: Hellenic Polytheism” by Sarah Kate Istra Winter
“Oracle Bones Divination: The Greek I Ching” by Kostas Dervenis
“The Oracles of Apollo: Practical Ancient Greek Divination for Today” by John Opsopaus
Theoi Project – Comprehensive reference guide to the Gods and Greater Kinds.
Theoi Text Library – A collection of translations of works of ancient Greek and Roman literature.
Ekklesia Neoplatonismos Theourgia – Theurgic and Platonist gathering celebrating the divinely inspired Mysteries in the line of Pythagoras of Samos, Iamblichus of Chalcis, and Dionysius the Areopagite.
Nova Roma Wiki – An encyclopedia on Cultus Deorum.
Internet Sacred Text Archive – Archive of online books about religion, mythology, folklore and esoteric beliefs.
Neos Alexandria – A website dedicated to syncretic Hellenic-Kemetic practices, particularly derived from Ptolemaic and Roman Egypt.
Perseus Collection – Greek and Roman Materials.
DEO MERCURIO – Gallo-Roman Religion.
Approved & Recommended Blogs
Hearth of Hellenism – Hellenism
The Writer’s Tome – Iamblichean Platonism
Henadology – Proclean Platonism & Polytheist Theology/Philosophy
Huehue Tlamanitiliztli – Mexica Reconstructionism
Let’s Be Frank – Frankish Heathenry
Lārhūs Fyrnsida – Anglo-Saxon Heathenry
Sundorwīc – Anglo-Saxon Heathenry
Of Axe & Plough – Anglo-Saxon Heathenry & Gallo-Roman polytheism
Grennung Hund Heorþ – Anglo-Saxon Heathenry & Kemeticism
Golden Trail – Religio Romana & Iberian polytheism
Eugenius the Oracle – Religio Romana, Kemeticism & Anglo-axon Heathenry (Special thanks for creating Hellenic Faith’s banner!)
The Zoroastrian Temple – Zoroastrianism