Open access is an important step forward in the evolution of scholarly scientific communication.
As with most things, a number of people are using this positive development for their own self-interested purposes. In the realm of open access journals, this comes in the form of "predatory" publishers of open access journals.
Explore some of the more egregious examples of articles published in predatory journals:
A Scholarly Sting Operation Shines a Light on ‘Predatory’ Journals | Predatory Journals Recruit Fake Editor
Predatory Journals Hit by "Star Wars" Sting
Opinion: Why I published in a Predatory Journal
Think Check Submit Checklist
Beall's List (archived)
Directory of Open Access Journals
Thirteen Ways to Spot a Predatory Journal