This article is from the Wicca FAQ, by email@example.com (Rain of Teleport) with numerous contributions by others.
Aidan Kelly argues that all of Wicca derives from Gerald Gardner,
with some crucial editing and revision by his initiate Doreen Valiente.
Alex Sanders is widely thought to have acquired a Gardnerian book of
shadows, with which he started his own "Alexandrian" tradition, initiating
Janet and Stewart Farrar. Other well-known traditions include Raymond
Buckland's Seax Wicca, Victor and Cora Anderson's Faery Wicca and feminist
Dianic Wicca, which emphasizes the Goddess as put forward by such authors
as Zsuzsanna Budapest. There are also branches of Wicca identifying
themselves with various ethnicities and traditions such as druidism,
shamanism and so forth.