Open Access policies for many journals can be searched at SHERPA RoMEO by title, ISSN, or publisher. "Sherpa Romeo is an online resource that aggregates and analyses publisher open access policies from around the world and provides summaries of publisher copyright and open access archiving policies on a journal-by-journal basis."
SHERPA Juliet "is a searchable database and single focal point of up-to-date information concerning funders' policies and their requirements on open access, publication and data archiving."