The Journal Checker Tool is provided by cOAlition S to authors to support them in finding Plan S compliant “routes” through which to publish their articles. The tool allows an author to enter the name of a funder, an institution and the journal to which they plan to submit an article, and checks if this combination of funder, institution and journal offers any route to compliance with Plan S.
NASA - National Aeronautics and Space Administration
NIH - National Institutes of Health
NSF - National Science Foundation
MIT Libraries also provides a comprehensive list of major US research funder open access requirements for publications as well as data.