Speaking of the Bible as containing myths might be viewed as insulting by some people. However, in my view, myths are sacred stories (not "false" stories or stupid stories that people had before they knew the truth through science), so of necessity, they are found in the sacred books, like the Bible Ancient/Biblical History
Indiana University Folklore Institute: Includes a definition of folklore—good background for understanding what a folktale is.
Greek and Roman gods and heroes are featured in the sites listed below. Parada Greek Mythology Link: A widely useful site which explores many aspects of Greek mythology. There is an extensive list of biographies of individual mythological figures as well as illustrations and charts showing relationships between figures and outlining the structure of stories in different versions of myths.
The Legend of the Trojan War
The sites listed below deal with the nature of mythology in general, or with mythological narratives and/or images coming from several different cultures. Homepage @ University of Pennsylvania Museum of Archaeology and Anthropology: Anthropology (to be extremely brief) is the study of culture, and this often includes mythology. This museum has a fine series of online exhibits featuring artifacts that are important to the stories and rituals found in a culture.
Robert Graves Society: Robert Graves was a poet and scholar who studied myth and was the author of I, Claudius, a book-length dramatization of Roman history, among many other notable texts. This link is not a "quickie" access to mythological material, but it can be an excellent source for the person willing to browse a bit. Clio: Women in Mythology, Religion and Herstory
The Gnosis Archive: Gnosticism is a kind of personal religion. It existed in ancient times, and there are modern versions of it. It expresses this personal religious experience through mythical materials. Gnostics use myths—often myths from ancient cultures—to show a kind of transcendent truth of a theological or philosophical nature. Vampires Or Gods? by William Meyers
This term usually refers to the stories coming from Iceland, Germany, Norway, or Sweden.
Old Norse Mythology . . . : This page is titled "General Information about Sweden," and the site considers the image of the god Loki in different sources. (A "source" usually means a literary or historical work from which we get a mythological story.)
The trickster is a special kind of hero found in myths. He is not always a hero in the sense of a person you'd want to emulate, but he is always interesting, and it's fun to watch him snare the unwary in his wiles.
Tricksters around the World