Predatory publishers are exploitative publishers charging sometimes excessive publication fees to authors without offering the usual editorial and publishing support associated with legitimate journals. There isn't a definitive list of predatory publishers available.
Berger, M., & Cirasella, J. (2015). Beyond Beall's list: Better understanding predatory publishers, College & Research Libraries News. Retrieved from http://crln.acrl.org/index.php/crlnews/article/view/9277/10342
Pleffer, A., & Shrubb, S. (2017, March 27). Not the Beall and end-all*: Assessing quality publications from multiple perspectives [Blog post]. Retrieved from https://aoasg.org.au/2017/03/27/not-the-beall-and-end-all/
Vanity publishers are publishing houses which charge authors to have their works published without the selection criteria usually used in hybrid publishing models. Protect your future academic credibility and ensure maximum prospects for future publishing of your work in credible journals by carefully evaluating the credibility of these publishers BEFORE accepting any offers. Refer to our Choosing publishers section in this guide.
Torres, M.R. (2012, June 24). Advice: Dissertation for sale: A cautionary tale [Blog post]. Retrieved from http://www.chronicle.com/article/Dissertation-for-Sale-A/132401/?cid=wb&utm_source=wb&utm_medium=en