Eigenfactor: The Eigenfactor Score is a measure of a specific journal's importance to the scientific community. Scores are based on 5 years of citations. Search by journal name or journal subject category.
Google Scholar journal metrics: Lists of 20 top publications for major disciplines and many subdisciplines. To view your subject's top journals, click "View Top Publication" at the bottom of page, then choose your discipline, and narrow down to subdiscipline, if desired.
Predatory journals are part of an exploitive open access publishing business model involving charging authors publication fees without providing editorial and other publishing services associated with legitimate journals (open access or not).
Check out the Metrics Toolkit, developed by Indiana University in partnership with Altmetrics and Force11.
The Metrics Toolkit provides evidence-based information about research metrics across disciplines, including how each metric is calculated, where you can find it, and how each should (and should not) be applied. You’ll also find examples of how to use metrics in grant applications, CVs, and promotion dossiers.
There are two ways to use the Toolkit. Explore metrics to quickly look up the metrics you want to learn more about, by name. Or you can choose metrics that are best for your unique use case by filtering based on the broad discipline, research output, and desired impact.