"The Unified Astronomy Thesaurus (UAT) is an open, interoperable and community-supported thesaurus being developed to unify the existing divergent and isolated Astronomy & Astrophysics thesauri into a single high-quality, freely-available open-source thesaurus which will be of immediate value to both research and research support, and provide a mechanism for reviewing, discussing and evaluating the continuous evolution of terminology in these fields."
Of course, be skeptical of all ranking systems.
You might also refer to Cabell's Directories of Publishing Opportunities (covers some disciplines: Nursing, Health Administration) and UlrichsWeb for information that might be useful. For open access journals, check if they are listed in the Directory of Open Access Journals. You might also search WorldCat to see how many libraries say they have a journal.
Contact me if you would like to discuss this or need help using the resources. We have a library guide about Scholarly Communication, including topics such as measuring impact.