Open access to over a million e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.

BioMed Central is an STM (Science, Technology and Medicine) publisher of nearly 300 open access, online, peer-reviewed journals.

A open access monograph publisher formed by a consortium of colleges and universities.

A grassroots response to the crisis in scholarly publishing in the humanities, Open Humanities Press is an international open access publishing collective whose mission is to make leading works of contemporary critical thought freely available worldwide.

Focusing on biological and medical sciences this provides open peer review and fast publishing time as well as lower article fees than other open access journals.

PLoS is a nonprofit publisher, membership, and advocacy organization with a mission to accelerate progress in science and medicine by leading a transformation in research communication.

The aim of the Directory of Open Access Journals is to increase the visibility and ease of use of open access scientific and scholarly journals thereby promoting their increased usage and impact. The Directory 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 a one stop shop for users to Open Access Journals.

BASE is one of the world's most voluminous search engines especially for academic open access web resources.

RoMEO is a searchable database of publisher's policies regarding the self- archiving of journal articles on the web and in Open Access repositories.