Academic Search Complete provides full-text for more than 4,650 publications, including full-text for more than 3,600 peer-reviewed journals. PDF backfiles to 1975 or further are available for well over one hundred journals, and searchable cited references are provided for more than 1,000 titles.
SpringerLink provides ebooks and journals in business, economics and finance, education, environmental science, engineering, health & medicine, law, materials, mathematics & statistics, sciences, and more. New titles are added frequently. To get access to available content, uncheck the "Include Preview-Only content" box at the top left of SpringerLink. A lock icon means there is no access to content. Ebooks can be downloaded in PDF format and kept forever for free. Print copies of most titles can be ordered for $25.00. SpringerLink supports an unlimited number of simultaneous users.
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.