Ensure you evaluate any Open Access research materials you use for credibility and quality. For help with this, check The Good, The Bad and The Ugly, or, Why It's a Good Idea to Evaluate Web Sources (from New Mexico State University Library)

• Google Books
  Can search and view complete older books with expired copyright and books where the publisher has given viewing permission. Try an advanced search.

• Project Gutenberg
  Provides access to more than 34 000 digitized books that are available in the public domain (the copyright has expired).

• BioMed Central
  Provides access to peer-reveiwed articles in more than 100 journals covering topics in biology and medicine.
• Directory of Social Science Open Access e-Journals including DOAJ - Anthropology and DOAJ - Gender Studies
  An extensive directory of scholarly open access journals from around the world.
• Free Medical Journals
  Provides links to dozens of open access medical journals.
• HighWire Press - Anthropology
   Most, but not all, are free for download.
• JURN: Directory of Scholarly Ejournals
  A curated academic search-engine and directory of scholarly journals in the social sciences and humanities.
• Open J-Gate
  A searchable index of thousands of academic, research and industry journals.
• Public Library of Science (PLoS)
  Publishes a range of open access scientific and medical research articles and other scientific literature. Relevant for some physical and medical anthropology topics.

• PubMed Central Canada
  A free digital archive of full-text, peer-reviewed health and life sciences literature, including medical anthropology and ethnography, based on the US National Library of Medicine archive PubMed Central.

• Canadian Institutional Repositories
  Links to Institutional Repositories maintained by Canadian universities.
  
• Directory of Open Access Repositories (OpenDOAR)
  A directory of repositories worldwide that house open access research materials.
• Synergies: Canada's SSH Research Infrastructure
  Indexes research results in social sciences and humanities published in Canada.