These lists do not necessarily represent the opinion of Yale University librarians; they are merely information that may be useful to authors looking for a journal to publish in. 

"Potential, possible, or probable predatory scholarly open-access publishers" from Scholarly Open Access: Critical analysis of scholarly open-access publishing

"Potential, possible, or probable predatory scholarly open-access journals" from Scholarly Open Access: Critical analysis of scholarly open-access publishing

Beall's List of Suspicious Journal and Publishers (updated)