GISL archive of documents that members use in their own libraries
Business
globalEDGE - International economic data on countries, U.S. states, trade blocs and industries
GuideStar - Information on non-profit companies
S.E.C. EDGAR - Database of foreign and domestic company registration statements and financial reports
U.S. Bureau of Labor Statistics - Federal database of labor market activity, working conditions, and changes in economic indicators
U.S. Economic Census - Federal statistics on U.S. businesses, industries, and local and national economics
Government
CIA World Factbook - Information on 267 countries
Congress.gov - Searchable database of U.S. federal legislation
FBI: Uniform Crime Reports - Compilations of national crime statistics
FCSM: Statistics - Access the entire body of statistics produced and collected by all agencies of the U.S. government
National Archives - Search the NARA archival databases for government archival information including military records, government spending, and international relations
U.S. Census Bureau - All of the U.S. Census data and analytical reports on population trends
Headlines and Periodicals
Library Of Congress Newspaper Collection easy to search collection of historical U. S. newspapers
Politifact Truth-o-Meter How honest are politicians, really? fun tool for government students
History
Avalon Project - Law and diplomacy documents from 4000 BC to the current day.
Chronicling America Collection - Digital newspaper archives from each state spanning 1836-1922.
David Rumsey Map Collection - Over 30,000 searchable historical maps.
Digital Public Library of America - Over 11 million items from U.S. libraries, archives and museums.
Europeana - Digital collection of books, art, video and audio from libraries and museums across Europe.
Literature
The Academy of American Poets - Collection of poetry from classic and contemporary poets, interviews and biographies.
Digital Commons Network – Arts and Humanities Collection - Free, full-text peer-reviewed articles from universities and colleges worldwide.
Encyclopedia of Science Fiction - A comprehensive, scholarly, and critical guide to science fiction in all its forms.
Encyclopedia of Fantasy - Sister volume to the Encyclopedia of Science Fiction providing scholarly and critical articles on fantasy in all its forms.
Project Gutenberg - Over 50,000 free eBooks.
Science
Centers for Disease Control - Data on diseases and conditions around the globe
Medline - Medicine and health data as well as articles on human health
NASA - Current and historical data on U.S. and international space exploration
National Agricultural Library - Provides technical information on agricultural research and related subjects
National Weather Service - Weather forecasts, weather information and historical data
Science.gov - Federal directory of science data from various U.S. government entities
USDA Plant Database - Standardized information about plants in the United States
Utilities and Tools
Audacity free software for recording and editing sounds
Creately diagramming software that allows online collaboration
Easelly free infographic creator
FotoFlexer online photo editor
GIMP Gnu Image Manipulation Program free photo editing software
HelloSign a Chrome extension that allows you to sign documents in your browser
Kahoot! replace your old Jeopardy PowerPoint games with this online game-based learning system
Loopster online video editing tool
Our Timelines create timelines from a 5 to 140 year span
Piktochart free infographic creator
Quizlet make flashcards, spelling drills, pre-tests and other study prep, or search the database for other users' materials
Twine a really neat way to construct online, non-linear, interactive stories (try the Cat Petting Simulator for an example)
Zamzar - online file converter
Multipurpose Collections
American Archive of Public Broadcasting - Joint project of the Library of Congress and WGBH Boston to collect the most significant public television and radio programs of the past 60 years
Digital Commons Network - Free, full-text peer-reviewed articles from universities and colleges worldwide
Google Books - Searches books and periodicals. Some resources are available in full, others only show excerpts
Google Cultural Institute - View high definition artwork and artifacts from international galleries and museums
Google Scholar - Searches the free Internet and subscription databases for scholarly/peer reviewed articles
The Internet Archive - Non-profit archive of digitized media: Console Living Room, LibriVox, TV News Archive, USGS Maps
Library of Congress Digital Collections - Archived books, manuscripts, audio, video, maps, photos and more
Liveplasma music recommendation service: type in an artist and find others you might like
Next Reads Bookseer get book suggestions based on what you've already read
Refdesk.com - Resources for checking pretty much any fact you can think of
Smithsonian Learning Lab - Digital access to millions of resources from across the Smithsonian museums
WorldCat - Simultaneously search over 10,000 libraries around the world
Media
Audio
Free Music links to copyright free music. Most of the sites offer free music to download but check the individual sites for citation information
Free Music Archive (different site from above) tons of Creative Commons music from WFMU
Freesound Creative Commons licensed sounds archive perfect for media projects
IncompeTech royalty free music for use in any sort of project as long as you give an attribution
Internet Tip: Royalty Free music links to Creative Commons music and advice on how to get permission from to use music
Books
Free Science a collection of science e-books
International Children's Digital Library full e-books for children up to 13 years old
LibriVox public domain audio books
Metropolitan Museum Publications nearly 400 books about fine art
Penn Digital Library University of Pennsylvania
Perseus Digital Library huge collection of classic (Greek, Roman, etc.) texts
Project Gutenberg vast collection of ebooks operated on voluntary donations
Rare Book Room photographs and scans of great and rare books from libraries around the world
Sacred Texts religion and spirituality
Yale Avalon Project e-books and documents on law and history
Images
Burst CC0 pics geared toward product promotion
Clker royalty-free images including clip art and photos
ClipArt ETC gorgeous Victorian-style line drawings
Creativity103 interesting collection of mostly abstract images
EveryStockPhoto search engine for photos that are public domain or licensed for free use
Flickr Commons mostly historical pictures that are public domain or Creative Commons licensed
FreeImages large collection of royalty free clipart
Freestocks a slick collection of free images
Getty Open Content makes images of some of its collection available through this search interface
Gratisography free high-resolution photographs
Kaboom free CC0 pictures
Morguefile pictures can be used and remixed, even in commercial applications, with no attribution requirement
NARA has an online collection for almost anything in U.S. history
NASA is the go to place for astronomical and space exploration images
Negative Space free CC0 photos
New Old Stock scans of antique magazine and newspaper advertisements and photos
NOAA Photo Library is a great place to look for pictures of weather and the sky
PDPics gorgeous high resolution, public domain images
Pics4Learning.com copyright-friendly image library for teachers and students
Pixabay deep collection of high quality images
Reusable Art vintage public domain images
Smart Servier Medical Art free medical images
SplitShire free CC0 images
StockSnap.io free CC0 images
UnSplash amazing high resolution photos, be sure to check their archive for more
USDA is a great place to look for pictures of animals and other agricultural images
Visible Earth NASA images of Earth from space
Video
Websites that Collect Links to Free Resources
The Free Software Directory - Education Category
Free Technology for Teachers from Richard Byrne's blog