Comprehensive guide that delves into the mythology of Greece. Sections on their gods (Theoi), spirits (Daimones) monsters, (Theres) and much more. Sections can include family trees and maps relating to the mythology, a gallery of images from Greek and Roman art, and a bibliography.
In this resource, you can read popular folk tales from all over this world, in their original or a translation. The stories have been classified along the Aarne-Thompson-Uther classification, which is the established standard for folk tales
Project Gutenberg has a collection of folklore free of charge. It also holds small collections of mythology, children's myths and fairy tales. To access these simply go to the book shelves section and find your topic of interest.