World mythology collections free online

Greek

• Bulfinch's Mythology: https://archive.org/details/agefableorbeaut00bulfgoog

• The Odyssey of Homer: https://archive.org/details/odysseyhomer00palmgoog/page/n406/mode/2up

Judaic

• Dictionary Of Deities And Demons In The Bible: https://archive.org/details/dictionary-of-deities-and-demons-in-the-bible/mode/2up or https://archive.org/details/dictionary-of-deities-and-demons-in-the-bible-van-der-toom-becking-van-der-horst/page/n1/mode/2up

• The Encyclopedia of Jewish Myth, Magic and Mysticism: https://archive.org/details/encyclopedia-of-jewish-myth-magic-mysticism/page/n1/mode/2up

• The Legends of The Jews, Louis Ginzburg: https://www.gutenberg.org/ebooks/author/651 or https://www.swartzentrover.com/cotor/e-books/misc/Legends/Legends of the Jews.pdf

Latvian

• Digital Archives of Latvian Folklore

• Archive of Latvian Folklore

Māori

• The Ancient History of the Māori: https://archive.org/details/ancienthistoryof01whit

• Māori Religion and Mythology: https://archive.org/details/maorireligionmyt00shor/page/n5/mode/2up

Melanesian

• Volume 9 of The Mythology of All Races: https://archive.org/details/mythologyofallra91gray

Native American (no this is not American culture; it's a different culture)

• The Encyclopedia of Hočąk (Winnebago) Mythology: https://hotcakencyclopedia.com/

Norse

• The Poetic Edda: https://archive.org/details/poeticedda00newy

• The Prose Edda: https://archive.org/details/proseedda00brodgoog

British

• Faith and Folklore by Carew: vol 1, vol 2

Arabian

• Burton's Arabian Nights: https://burtoniana.org/books/1885-Arabian Nights/index.htm