OAIster indexes digital resources held in open archive collections around the world. [info]

Coverage:  2000 - Present

Ockham's Work of Ninety Days, his first major work in a twenty-year campaign against Pope John XXII, is a thorough discussion of the place of voluntary poverty in religious life, property in civil life, and their relation to natural rights and human law. [info]

OCLC's FirstSearch is an interactive online information system that gives you vital, timely information about books, journal articles, films, computer software, and other materials in your subject area. [info]

OECDiLibrary is the Online Library of Statistical Databases, eBooks, Periodicals, and Working Papers from the Organisation for Economic Co-operation and Development. [info]

Note(s):  Works best with Internet Explorer.
Coverage:  1960 -
Updated:  Regularly

The International Bibliographic Information on Dietary Supplements (IBIDS) database provides access to bibliographic citations and abstracts from published, international, scientific literature on dietary supplements. [info]

The Official Documents System of the United Nations is "the electronic repository for official documents published by the United Nations." It includes all UN resolutions from the General Assembly, Security Council, Economic and Social Council, and Trusteeship Council from 1946, the origin of the UN, to the present. [info]

Note(s):  Internet Explorer 5.5 or Netscape Navigator 6.21 (or higher) are required to access this database.
Coverage:  1946 to date for UN resolutions; 1993 to date for other documents
Updated:  Regularly
Language:  English,French,Russian,Chinese,Spanish,Arabic

OncoLink was founded in 1994 by Penn cancer specialists with a mission to help cancer patients, families, health care professionals and the general public get accurate cancer-related information at no charge. [info]

This proprietary database of human genes and genetic disorders is hosted online by the National Institutes of Health / National Center for Biotechnology Information. [info]

Researchers, educators, students, and clinicians now have online access to a compendium of genetic disorders and information from the entire field of genetics. [info]

This service covers free, full text, quality controlled scientific and scholarly journals. [info]

Coverage:  1990s –
Updated:  Continuously
Language:  Various

The Open Science Directory provides access to a wide range of journals to researchers in both developing and developed countries. [info]

OpenDOAR allows you to find and access freely available research in all subjects found in academic repositories. [info]

The database contains 1581 vernacular texts (19.1+ million words, 447,675 unique forms, 165 MB of textual data) the majority of which are dated prior to 1375, the year of Boccaccio's death. [info]

Note(s): 
Coverage:  Italian texts published prior to 1375
Language:  Italian

ORBIS is a comprehensive database of more than 35 million public and private companies worldwide. [info]

Note(s): 

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Updated:  Daily

This is a database of rare diseases and orphan drugs, sponsored by a variety of French and European Union health agencies. [info]

A database containing financial information on globally listed public companies, including banks and insurance firms from over 190 countries. [info]

Coverage:  1996 - present
Updated:  continuous

The Osterreichische Bibliographie Online, or Austrian National Bibliography Online, is the record of books in print in Austria, theses written in Austria, and books about Austria published in other countries. [info]

Coverage:  2003 to date
Updated:  Biweekly
Language:  German

The Austrian Dissertations Database was established and is maintained by the Austrian Research Centers GmbH (ARC) on behalf of the Austrian Federal Ministry of Education, Science and Culture. [info]

Coverage:  1990 -
Language:  German

The OHB is a bibliography of historical literature published in Austrian books, periodicals, festschriften and dissertations since 1965 and relating primarily to Austrian history. [info]

Coverage:  1965-present
Language:  German

OTseeker is a free database of evidence-based practice resources for occupational therapists. [info]

Combines a rich array of historical and cultural information about the African American experience with selected primary documents, web sites, and maps. [info]

Coverage:  17th Century - Present
Updated:  Updated regularly

Oxford Art Online provides Web access to the entire text of The Dictionary of Art (Grove, 1996, 34 vols), The Oxford Companion to Western Art, Encyclopedia of Aesthetics, and The Concise Oxford Dictionary of Art Terms including images. [info]

Coverage:  Prehistory - present
Updated:  Quarterly

The definitive quick reference tool for information about the ancient Greek and Roman worlds. [info]

Coverage:  Classical Greco-Roman Period

The Dictionary of National Biography has for over 100 years been the definitive source of reference biographical information about persons who have had a significant impact on British history. [info]

Coverage:  Fourth Century B.C.E. to Present
Updated:  Three Times Yearly

A comprehensive dictionary of the English Language that stresses the historical origins of words. [info]

Oxford Music Online is the access-point for current and forthcoming Oxford music reference subscriptions and products, including Grove Music Online, The Oxford Companion to Music, and The Oxford Dictionary of Music. [info]

Oxford Reference Online allows searching over 150 basic reference sources, covering subjects such as art and architecture, biology, classics, computing, economics & business, environment, history, language, literature, law, medicine, mythology & folklore, performing arts, physics and math, politics, social sciences, religion & philosophy, and science in general. [info]

Coverage:  Mainly current publications
Updated:  Regularly