Creative Commons Sound Depository

Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more.

"Search America's historic newspaper pages from 1836-1922 or use the U.S. Newspaper Directory to find information about American newspapers published between 1690-present."

"Project Gutenberg offers over 46,000 free ebooks: choose among free epub books, free kindle books, download them or read them online."

HathiTrust is a partnership of academic & research institutions, offering a collection of millions of titles digitized from libraries around the world. The HathiTrust Digital Library brings together the immense collections of partner institutions in digital form, preserving them securely to be accessed and used today, and in future generations.

NYPL Digital Collections provides free and open access to nearly 700,000 images digitized from the The New York Public Library's vast collections, including illuminated manuscripts, historical maps, vintage posters, rare prints, photographs, streaming videos, and more added each day.

Harvard Digital Collections provides free, public access to more than 6 million objects digitized from our collections - from ancient art to modern manuscripts and audio visual materials.

Many Flickr users have chosen to offer their work under a Creative Commons license, and you can browse or search through content under each type of license.

Columbia's digital library collection websites are a gateway to digital reproductions and descriptions of photographs, posters, drawings, objects, ephemera, and manuscripts as well as other archival material from Columbia's rare and special collections.

Collection of audio available under a Creative Commons license.

Collection of European audio, images, text, and video, much of which is available to use freely.

A repository of freely available images, audio, and video. Content is available under a Creative Commons Attribution/Share-Alike license or is available in the public domain.

Searches images and audio available under a Creative Commons license or in the public domain.

Find royalty-free production music, audio, sound effects, and loops for your projects.

Open access GIS System. Values individual and local contributions.

Historical maps sorted by time period and location.

Digitized map collection from the Library of Congress

Web mapping application from the United States Geological Survey that allows users to search for and download remote sensing data through entering criteria for the area of interest, date, and type of data.

In 2009, USGS began the release of a new generation of topographic maps (US Topo) in electronic form, and in 2011, complemented them with the release of high-resolution scans of more than 178,000 historical topographic maps of the United States

Digitized collection of international maps

TIGER (Topologically Integrated Geographic Encoding and Referencing) products are spatial extracts from the Census Bureau's MAF/TIGER database, containing features such as roads, railroads, rivers, as well as legal and statistical geographic areas.

Houses over 250,000+ open data sets from 5,000+ organizations worldwide. It is an easy-to-configure community engagement platform that organizes people, data, and tools through information-driven initiatives. Organizations of any type and any size, including government agencies, nonprofit groups, and academia, can maximize engagement, communication, collaboration, and data sharing using the ArcGIS Hub initiative-based approach.

Extensive data catalog maintained by the U.S. General Services Information aiming to provide federal data under the terms of the Open Data Policy.

DataDryad.org is a curated general-purpose repository that makes the data underlying scientific publications discoverable, freely reusable, and citable

The United States Goverments Open Access Repository for Data Sets.

"re3data.org is a global registry of research data repositories that covers research data repositories from different academic disciplines. It presents repositories for the perma"nent storage and access of data sets to researchers, funding bodies, publishers and scholarly institutions. re3data.org promotes a culture of sharing, increased access and better visibility of research data.

Contains repositories for Astronomy and physics, Biology and life sciences, Chemistry, Computer science and source code, Earth, ecology, environment, and geosciences, GIS and geography, Humanities and social sciences, and Species-specific repositories

"WorldWideScience.org accelerates scientific discovery and progress by providing one-stop searching of databases from around the world"

"Data for Research is a free service for researchers wishing to analyze content on JSTOR through a variety of lenses and perspectives. DfR enables researchers to find useful patterns, associations and unforeseen relationships in the body of research available in the journal and pamphlet archives on JSTOR. To this end we provide data sets of documents to researchers: OCR, metadata, Key Terms, N-grams and reference text."