From Beall’s List of Potential Predatory Publishers:
Instructions: first, find the journal’s publisher – it is usually written at the bottom of the journal’s webpage or in the “About” section. Then simply enter the publisher’s name or its URL in the search box above. If the journal does not have a publisher use the Standalone Journals list.
All journals published by a predatory publisher are potentially predatory unless stated otherwise.
Link to the rest at Beall’s List of Potential Predatory Publishers
In the sidebar, you will find links to other sites, including the following:
List of journals falsely claiming to be indexed by DOAJ
DOAJ: Journals added and removed
Nonrecommended medical periodicals
Flaky Academic Journals Blog
PG notes that vanity publishers don’t just prey on would-be commercial authors. They also fool academics into paying for publication of their works in legitimate-sounding professional publications that won’t do much for the academic’s “publish or perish” requirements.