Open Access

There are two models of Open Access that apply to Journals:

• GOLD Open Access: Content is delivered by journal publishers and is freely available to the public.  In some cases, a journal provides gold open access only for those individual articles for which an Article Processing Charge (APC) has been paid by the author. The publisher conducts the peer review process. (Gold OA publisher examples: the Public Library of Science and Biomed Central)
• GREEN Open Access:  The author retains a preprint version of an article and posts it to a repository or website. (see "Authors' Rights section of this guide)  After publication, the author archives the peer-reviewed postprint of the article for public use in an institutional repository or central repository (e.g. PubMed Central). No APC is assessed.  Access is granted to the postprint after a publisher's embargo period has expired (Standard embargo period is 12 months).   

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.

• SHERPA/RoMEO Database A regularly updated database of peer-reviewed journal publishers’ agreements.  Use it to find publishers or journals that permit deposit of a final version of a paper in a public repository, such as PubMed Central or in an institutional repository, allowing scholars to find the full-text version through a Google search. Authors are able to compare and select the most author-friendly and dissemination-friendly publisher agreement before submitting a paper for publication.
• See also Sherpa/Juliet which provides current information on research funders'  open access policies and Roarmap, the Registry of Open Access Repository Mandates and Policies, a searchable international registry charting the growth of open access mandates and policies adopted by universities, research institutions and research funders that require or request their researchers to provide open access to their peer-reviewed research article output by depositing it in an open access repository.
• The Open Access Spectrum Evaluation Tool quantitatively scores journals' degrees of openness.  It offers a concrete, quantifiable mechanism to analyze publications' policies. The OAS Evaluation Tool aims to provide unprecedented insight and transparency into scholarly journals' degree of openness.

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.