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.
Click on British Flag for English-language interface. Then click "Preferences" and set it to search only journals with freely available full-text articles. The scope of this resource makes it worth the effort