About.com: Myth: Greco-Roman
The twelve Olympians and other gods and goddesses of the Greco-Roman pantheon.
http://ancienthistory.about.com/library/bl/bl_myth_europe_grecoroman_index.htm
Forged By Lightning: The Gods
Extensive information on the Greek, Roman and Carthaginian Gods and Goddesses mentioned in Forged By Lightning: A Novel of Hannibal and Scipio.
http://www.hannibalofcarthage.org/gods.php
Greek and Roman Mythology
List of names from Greek and Roman mythology, from Infoplease.com.
http://www.infoplease.com/ipa/A0197622.html
MythNET
A source of information about Greek and Roman Mythology. Learn about the Gods, Mythical Creatures and Monsters, the Heroes and their stories and genealogy.
http://www.classicsunveiled.com/mythnet/html/index.html
Name and Fame: Greek and Roman
List of names of famous and not-so-famous characters from Greek and Roman mythology.
http://www.nameandfame.org/greek.html
Oxford Classical Mythology Online
Retells the myths and legends of Greece and Rome enabling students to explore and appreciate the most significant ancient sources of classical legends and myths.
http://global.oup.com/us/companion.websites/9780195397703/