There are two models of Open Access that apply to Journals:
NOTE: Some funding agencies include clauses to allow for the use of grant funds to cover APC fees, including the National Science Foundation and the National Institutes of Health.
More for-profit publishers are supporting open-access titles. For example, see ScienceDirect's list of OA titles. Elsevier also gives authors the option to publish open access articles in several of their established journals. From the linked list you can limit your results to open access journals or journals that contain open access articles.