Robuta

https://scholarlyoutlaws.com/index.php/2025/02/21/continuing-where-beall-left-off/
Scholarly Outlaws provides lists of predatory publishers and fraudulent conference organisers with criteria to measure the degree of culpability
predatory publishersbealllistcontinuedjournals
https://www.springernature.com/in/editors/research-integrity/predatory-publishers-course
predatory publishersspringer naturecourseeditors