Interactive simulations from University of Colorado at Boulder. Subjects include: Biology, Chemistry, Earth Science, Math & Physics.

List of simulations and virtual labs from CUNY-College of Staten Island. Note that some resources are free but not open.

List of simulations and virtual labs from the Arthur Lakes Library at the Colorado College of Mines.

Contains over 500 million images with the ability to limit by license type (public domain, CC0, or Creative Common), source, image type, file type, aspect ratio, and image size. Also contains audio and video.

The Getty makes available, without charge, all available digital images to which the Getty holds the rights or that are in the public domain to be used for any purpose. No permission is required.

Features items from the Library's digital collections that are free to use and reuse.

Noun Project contains the most comprehensive icon collection in the world with designers from 120+ countries. Also includes high-quality photos.

Thousands of images released free of copyrights under Creative Commons CC0. You may download, modify, distribute, and use them royalty free for anything you like, even in commercial applications. Attribution is not required.

Filter results by usage rights.

Browse videos by the needed CC license.

After doing a search, select “Filter” under the search box and then “Creative Commons."

Music community with remixes and samples with Creative Commons licenses. They can be reused. Some songs might have certain restrictions, depending on their specific licenses.

Free downloads under Creative Commons and other licenses. The license can be seen by clicking on the title of the song.

Collaborative database of sounds with Creative Commons license.

Millions of images, music, and video files that are free to use.

Royalty-free music, sheet music, and educational materials.

The archive contains billions of web pages and millions of books, texts, audio recordings, videos, images, and software programs.