1. –  Open access to 1,487,358 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance, Statistics, Electrical Engineering and Systems Science, and Economics from the Cornell University.
  1. Academic journals
  2. AgEcon Search
  3. Agricola (index)
  4. African Journals Online (AJOL)
  5. BioMed Central (BMC)
  6. PUBMED Central
  7. ChemSpider. –  ChemSpider enables researchers to discover the most comprehensive view of freely available chemical data from a single online search. It is owned by the Royal Society of Chemistry.
  1. Digital Public Library of America (DPLA). – The Digital Public Library of America brings together the riches of America’s libraries, archives, and museums, and makes them freely available to the world. It strives to contain the full breadth of human expression, from the written word, to works of art and culture, to records of America’s heritage, to the efforts and data of science.
  2. ERIC is an online library of education research and information, sponsored by the Institute of Education Sciences (IES) of the U.S. Department of  Education.
  3. IDS Digital Library
  4. MDPI journals
  5. Project Euclid  – Access over 70% of the journal articles free on theoretical and applied mathematics and statistics scholarship worldwide.
  6. Scientific Research Publishing(SCIRP)  Access more than 200 open access, online, peer-reviewed journals covering Biomedical & Life Sciences, Business & Economics, Chemistry & Materials Science, Computer Science & Communications, Earth & Environmental Sciences, Engineering, Medicine & Healthcare, Physics & Mathematics, Social Sciences & Humanities.
  7. Springer Open
  8. Directory of Open Access Journals (DOAJ)
  9. Public Library of Science (PLOS)
  10. Electronic Library of Mathematics
  11. The American Mathematical Society
  12. e-Math for Africa
  13. OpenDOAR
  14. Open access theses and dissertations
  15. PressReader
  16. JoVE