| http://www.indexcopernicus.com | Multidisciplinary |
| www.ajol.info | African Journal Online |
| www.africanjournalseries.com | |
| www.devconsortservices.com.ng | |
| www.doaj.org | Directory of open access journals |
| www.sabinet.co.za | South African Journal |
| www.oajse.com | Open Access Journal Search Engine |
| www.lub.lu.se/en.html | Lund university |
| www.dovepress.com | Free Scientific and Medical Materials |
| www.copernicus.org | Access & Publication |
| www.kb.se/hjalp/english | National Library of Sweden |
| www.scrip.org/journal | Open Access Scientific Journal |
| www.openj-gate.org | Connecting Repositories (IS/CS) |
| www.core.kmi.open.ac.uk/search | |
| www.eric.ed.gov | Education Resource Information Center |
| www.searchteam.com | Online Search and Collaboration |
| www.worldwidescience.org | Research and Academic Collaboration |
| www.nber.org | National Bureau of Economic Research |
| www.philpapers.org | Philosophy Papers |
| http://arxiv.org | Cornell University (Sciences) |