The Directory of Open Access Journals, or DOAJ, indexes and provides access to open access journals, most of which are peer-reviewed. Elseiver also has an alphabetic directory of open access journals covering a wide range of academic subjects, all of which offer articles that are immediately free to access and download. Another useful source for free peer-reviewed articles is Scholarpedia, an open access encyclopedia in which every submitted article is peer-reviewed by a panel of experts before publication.
For an article to be listed in the DOAJ, it is mandatory that users would be able to read, download, copy, distribute, print, search or link to the full texts of the article. All articles indexed in this database are sourced from journals using a funding model that does not charge users or institutions for access to the content.
Scholarpedia is a project inspired by the open model of Wikipedia, It uses the same "wiki" layout for its website and allows anyone to propose revisions to almost any article. However, it seeks to provide content with academic and scientific credibility; therefore, all new article proposals undergo a process of sponsorship, which is intended to validate the ability and authority of authors who propose them. Additionally, before publication, every article is reviewed by at least two scholarly experts.