Wikipedia:List of free online resources

Searching for photographs by content

Resources for sourcing and searching for photographs by the content that is depicted. Though the search engines may be accessed for free, indexed images themselves may be under restricted license.

• Google Books - Searchable archive of magazines and books (some full-text, including photograph captions and references to photographs from related articles and content).
• United States Library of Congress - Searchable archive of historic photographs, maps, performing arts, newspapers.
• Life (magazine) Photo Gallery Archives (web site) - Searchable archive of photographs of news and sporting events, celebrities, travel.
• NASA Images - Searchable archive of aeronautics, space and space exploration photographs.
• Pexels - Public domain photographs
• LibreShot (web site) - CC0 1.0 (public domain) photographs

Agriculture

• California Agriculture (web site) - peer-reviewed journal, reporting research, reviews and news from the University of California and its Agriculture and Natural Resources division

Biology and Medicine

• Open Biology (web site) - biology on the cellular level
• Entrez (web site) - Life Sciences search engine from the National Center for Biotechnology Information
• Global Health Observatory (GHO) (web site) - portal providing critical data and analyses for key health themes, as well as direct access to the full database, including the WHO Statistical Information System (WHOSIS)
• PubMed (web site) - comprises more than 19 million citations for biomedical literature from MEDLINE, life science journals, and online books from the United States National Library of Medicine (includes: PLOS ONE, Nutrition Journal)

• Europe PubMed Central - International Pubmed central repository
• PubMed Central Canada - Canadian repository

Chemistry

• ChemSpider – the Royal Society of Chemistry's free chemical database.
• MarinLit – the RSC's database dedicated to marine natural products research.
• PubChem is the world's largest collection of freely accessible chemical information of the National Institute of Health (NIH).
• The Merck Index Online – The Merck Index is one of the most reliable sources of key physical, pharmacalofical and historical information on chemicals, drugs and biologicals. Owned by the RCS.

Engineering and Design

• Dimensions Reference: - Dimensioned drawings documenting the standard measurements and sizes of everyday objects and spaces

Math

• arXiv - math/science archive
• Encyclopedia of Mathematics
• MathWorld
• PlanetMath

Nutrition

• Nutrition Journal - human nutrition journal by means of ethical guidelines
• Project Gutenberg's public domain books on Nutrition

Space

• European Space Agency - ESA
• NASA
• Space.com - space news
• Internet Archive collection of historic NASA films, in the public domain

Technology & computer science

• The Association for History and Computing - organisation dedicated to the use of computers in historical research
• NASA Technical Reports Server (NTRS) - resource for students, educators, researchers, and the public for access to NASA's current and historical technical literature since it was first released in 1994
• Free website Analyzer - is a free online service that collects information about domains and keywords for which they were optimized.

Anthropology

• ALLBUS Data Service: online archive of German General Social Survey data. Free download - for scientific purposes - of high quality data on attitudes, behavior, and social structure in Germany.
• Project Gutenberg's shelf of historic, public domain Anthropology Books
• Library of Congress Resource Links on Anthropology

Culture

• Culture.si. Texts about the culture of Slovenia are available under the CC-BY-SA 3.0 license, the same license as used by Wikipedia. See Enhance Wikipedia! and Terms of Use. Published by the Slovenian Ministry of Culture and Ljudmila (media laboratory).

Economics

• AllBusiness.com
  • List of Periodicals with articles available
• The Economist
• Index of Economic Freedom: from The Heritage Foundation/Wall Street Journal.
• International Monetary Fund: IMF research and links to World Economic Outlook.
• Review of Radical Political Economics: "The Review of Radical Political Economics (RRPE) publishes articles on radical political economic theory and applied analysis from a wide variety of theoretical traditions: Marxist, institutionalist, post Keynesian, and feminist. RRPE is published by Sage Publications."
• UNDP World Income Inequality Database
• UN Food and Agriculture Organization (FAO) FAOSTAT International data on food production, land use, nutrition.
• World Bank: World Development Indicators database.

Geography, places and travel

• BBC News: Country Profiles - includes audio and video clips
• The Canadian Encyclopedia (also in French)
• ELDIS: Country and Regional Profiles - a family of knowledge services from the Institute of Development Studies, Sussex
• Eurostat - statistics on European Union countries
• Federal Research Division: Country Studies - from the Library of Congress, published between 1988 and 1998, information on some countries may no longer be up to date
• The World Factbook (web site) - published by the Central Intelligence Agency of the U.S.

History

• Wikibooks: World History from Wikibooks, a Wikimedia Foundation project
• EuroDocs: Online Sources for European History: Wiki collection of primary source historical records from Western Europe, hosted by the Harold B. Lee Library at Brigham Young University.
• Talessman's Atlas of World History: Collection of world history maps ranging from ancient to modern times, by amateur historian Thomas Lessman
• The Historical Atlas of South Asia by Joseph Schwartzberg.
• Euratlas historical maps of Europe.
• National, State & Local Newspaper Archives - Collection of free newspaper archives in the United States, from the XooxleAnswers professional online research service.
• The History Guide - Material for high school (particularly AP European History) and undergraduate students. Includes lectures on Ancient and Medieval European History, Early Modern European History, Modern European Intellectual History, and 20th Century Europe
• Lectures in Medieval History - Lecture notes by Dr. Lynn H. Nelson, Professor Emeritus of Medieval History at the University of Kansas.
• Daily Report

Law

• African Court of Justice - African Union
• Coalition for the International Criminal Court
• Amnesty International: human rights.
• European Union law
• Human Rights Watch
• International Court of Justice - (ICJ) United Nations' judicial body
• International Criminal Court - ICC is in Hague, Netherlands governed by the Rome Statute
• Law Library of Congress - United States Internet Law Library of Congress

Political science

• Adam Carr's Election Archive: User:Adam Carr maintains the world's largest online archive of election statistics from every democratic country in the world.
• Reports and publications of the Brookings Institution, public policy think tank in Washington, D.C.
• Reports and publications of the Cato Institute, public policy think-tank headquartered in Washington, D.C.
• Reports and publications of the Center for American Progress, public policy think tank in Washington, D.C.
• EULib: large, searchable collection of official European Union news and documents.
• Foreign Affairs: periodical published by the Council on Foreign Relations.
• Foreign Policy: a leading quarterly of international affairs.
• Glossary of Political Economy Terms
• Hoover Institution: "a public policy research center devoted to advanced study of politics, economics, and political economy—both domestic and foreign—as well as international affairs."
• The Jamestown Foundation "The Jamestown Foundation's mission is to contribute to U.S. understanding of its strategic adversaries that pose a threat to democracy and freedom."
• : Kennan Institute for Advanced Russian Studies, Woodrow Wilson Center: think-tank on political, social, and economic issues affecting Russia and other successor states to the Soviet Union.
• Marxists Internet Archive - Collection of primary source documents
• Monthly Review: independent socialist journal.
• New Left Review: a key journal of the international Left.
• Paul Hensel's International Relations Data Site
• The Socialist Register
• Materialy Samizdata

Psychology

• Psychology's Feminist Voices (web site) - Collection of first-hand accounts of feminist psychologists (videos, interviews, profiles)

Religious studies

• The Catholic Encyclopedia
• Goettingen Register of Electronic Texts in Indian Languages (ancient and medieval Hindu, Buddhist and Jain texts)
• Internet Sacred Text Archive
• The British Library's complete collection of sacred texts
• Project Gutenberg's extensive shelf of historic, public domain Religious Texts
• Synod Commission for Monasteries of Ukrainian Orthodox Church
• Christian Cyclopedia

Sociology

• Project Gutenberg's public domain Sociology books