Open Access resources Include:

• Open Access Digital Library (Colorado Alliance GoldRush)
• Highwire Press Full Text Online
• Directory of Open Access Journals (Lund University)
  • Journal Info: look for Open Access alternatives for 18,000 journals. Includes information on author's self-archiving rights, cost per article for institutions, and more.
• Biomed Central
• Public Library of Science
• ProQuest/UMI Open Access Dissertation Publishing

Additional "free" full text resources include:

• NASA Astrophysics Data System (NASA-funded)
• DOE Information Bridge (US Department of Energy)
• More

You can search for an individual journal title in GoldRush. The GoldRush database contains an extensive list of Open Access journals.

Historical

• Gallica

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OpenDOAR: Directory of Open Access Repositories

The OpenDOAR service is being developed to support the rapidly emerging movement towards Open Access to research information. OpenDOAR is building a comprehensive and authoritative list of institutional and subject-based repositories, as well as archives set up by funding agencies - like the National Institutes for Health in the USA or the Wellcome Trust in the UK and Europe. Read more