There are many discipline-specific as well as multi-disciplinary open access journals. Below is a list of Directories to help you decide which open access publishing venue is right for you.
Be sure to avoid predatory journals and publishers when searching for OA publishing venues. Predatory journals are publishers are journals and publishers that imitate legitimate publishing venues, but do not practice ethical and sound methods of publishing.
Jeffery Beall, a librarian at The University of Colorado Denver, maintains a list of predatory journals and publishers. He uses a strict method of evaluation and has published the criteria for which he uses. Check this list before you select an OA publishing venue: