Stichting Pythagoras

The Pythagoras Foundation is an information center about the philosophy of Pythagoras, Pythagoreans, and Presocratic philosophers. They publich a free, yearly newsletter which often has some interesting material in it. Their definition of ‘Pythagoreanism’ is pretty broad (or, to put it another way, mirrors ancient definitions of what it meant to be Pythagorean rather than more strict, modern approaches to the question).