Table 1: This table provides a list of free, online academic search engines for various science disciplines.
| Academic Search Engine | URL | Disciplines | Help Files |
| Google Scholar | scholar.google.com | All | scholar.google.com/intl/en/scholar/help.html |
| ScienceDirect | http://www.sciencedirect.com/science/search | All | NA |
| Pubmed | www.ncbi.nlm.nih.gov/pubmed | Life sciences | www.nlm.nih.gov/bsd/disted/pubmedtutorial |
| IEEE Xplore | ieeexplore.ieee.org/Xplore/guesthome.jsp | Electronics, Electrical engineering, Computer science | NA |
| National Agricultural Library (AGRICOLA) | agricola.nal.usda.gov | Agriculture | agricola.nal.usda.gov/help/quicksearch.html |
| Education Resources Information Center (ERIC) | eric.ed.gov | Education | NA |
Table 2: List of databases containing free, full-text scientific papers and data sets.
| Database | URL | Disciplines |
| NASA Scientific and Technical Information (STI) | www.sti.nasa.gov/STI-public-homepage.html | Aerospace |
| SOA/NASA Astrophysics Data System | https://ui.adsabs.harvard.edu/ | Astronomy, physics |
| arXiv | arxiv.org/ | Physics, Mathematics, Computer science, Quantitative biology, Quantitative finance and statistics |
| CiteSeerX | citeseerx.ist.psu.edu/ | Computer science |
| Public Library of Science (PLOS) | https://www.plos.org/ | Life sciences |
| High Wire Press | highwire.stanford.edu/lists/freeart.dtl | Life sciences |
