For open access journals, DOAJ reviews the quality of the journals it accepts and adds to its listings. Journals accepted into DOAJ tend to be more reputable.
From the DOAJ Website: DOAJ's mission is to increase the visibility, accessibility, reputation, usage and impact of quality, peer-reviewed, open access scholarly research journals globally, regardless of discipline, geography or language.... DOAJ is committed to being 100% independent and maintaining all of its services and metadata as free to use or reuse for everyone.
Note! Hostos Library includes DOAJ in our list of Databases. It is useful for finding Open Access journals or articles in all disciplines & subject areas that have been screened for their quality. If you find a journal in DOAJ you know it's probably not a questionable or predatory journal.