Hellenion
Predominantly online organization devoted to the revival of ancient Greek polytheism.
https://www.hellenion.org/
Pagan Apologetics
Society, Religion and Spirituality, Pagan, Hellenismos - Pagan Apologetics. A collection of essays defending Hellenic polytheism and Paganism in general.
http://paganapologetics.faithweb.com
The Shrine of the Goddess Athena
Society, Religion and Spirituality, Pagan, Hellenismos - The Shrine of the Goddess Athena. Dedicated to the Goddess Athena.
http://www.goddess-athena.org/