Homage to Pythagoras: A variety of texts relating to Pythagoras and Pythagorean teachings.
Internet Encyclopedia of Philosophy: Pythagoras: Article which discusses the cosmological and ethical teachings associated with Pythagoras.
MacTutor History of Mathematics: Biographical article featuring several pictures and assorted testimonia.
Myth - Pythagoras: Review of Pythagoras' thoughts on cosmology and the myths. By Swedish author and historian of ideas Stefan Stenudd.
Pythagoras and the Pythagoreans: Fragments and Commentary: Arthur Fairbanks' translations of the text from the Hanover Historical Texts Project.
Pythagoras' Theorem: Includes diagrams, history, and links all related to the Pythagorean theorem.
The Wisdom of Pythagoras - Windsor Castle: A series of tenets attributed to Pythagoras.
Wikipedia: Pythagoras: Biography and works of a mathematician and philosopher.