Gods and Goddesses - a very complete directory

God Checker: Your Guide to the Gods

Ancient History from About.com - Search for ancient gods and goddesses in two ways, by culture or alphabetically, by the name of the specific god or goddess.

Encyclopedia Mythica: Greek Mythology

Mythweb - a very colorful that is fun to navigate

Mythology Guide - collected information on Greek and Roman myths

Greek Mythology Link

Greek Mythology: The Immortals

Classic Mythology

BBC - The Greek Myths