When we talk about Open Access, there are really two sides to the subject. One is access to publications that are open access; that is, they are not published in a manner that requires a subscription or purchase cost. In other words, you are looking for research material that is available free of cost (or almost free).
The other side of Open Access refers to the ability to publish in Open Access publications. The AUC Woodruff Library offers several means for you to engage in both pursuits.