I am asking about an official website build by an international and well known institution or recognized organization. I know those unaffiliated personal lists.
We already published a paper on this purpose but what is missing is an official database in which there is a consensus on this problematic.
This RG question has a link to three sites that are maintaining predatory journal lists. I would check all three, because some may be better updated than others.
Yes I do agree with you, those three databases are, known, good, and constantly updated (some of theme are just Blog websites) however, in an institution such as universities where we are working, can we consider them as a an official reference?