Open-access publisher of peer-reviewed scientific articles across the entire spectrum of academia. Research network for academics to stay up-to-date with the latest scientific publications, events, blogs and news.

Website traffic: 10.5M/month

4. OSTI.GOV

OSTI.GOV - OSTI.GOV is the primary search tool for Department of Energy science, technology, and engineering research information funded by the US Department of Energy and the organizational hub for the Office of Scientific and Technical Information. - search tool, Department of Energy science, Department of Energy technology, Department of Energy engineering, Department of Energy research information

Website traffic: 1.34M/month

5. Longdom Publishing SL

Longdom Publishing SL. is one of the leading international open access journals publishers covering clinical, medical, biological, pharmaceutical sciences, engineering, as well as management and technology oriented subjects.

Website traffic: 900K/month