Open access journals are those that anyone to look at the articles within the journal or magazine for free, rather than requiring a subscription.  There are a number of open access sources that are included in Drew's list of resources, such as DOAJ (Directory of Open Access Journals), OAIster (Open Archives Initiative), SSRN (Social Science Research Network) and PubMed Central.  Some organizations allow free access to their publications as well.

If you find that the article you want is requesting either a password or payment, request the article through Interlibrary Loan.