Directory of Open Access Journals
The DOAJ hosts a huge database of open access journals. The organization and search functions are great, and you can look up individual articles or entire journals.
“The aim of the DOAJ is to increase the visibility and ease of use of open access scientific and scholarly journals, thereby promoting their increased usage and impact. The DOAJ aims to be comprehensive and cover all open access scientific and scholarly journals that use a quality control system to guarantee the content. In short, the DOAJ aims to be the one-stop shop for users of open access journals.”