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About Collection of links to different US image collections in the public domain. Openness > Most of these images and graphics are available for use in the public domain, and they may be used and reproduced without permission or fee. However, some images may be protected by license. We strongly recommend you thoroughly read the disclaimers on each site before use. ...
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About
The Geograph British Isles project aims to collect geographically representative photographs and information for every square kilometre of Great Britain and Ireland, and you can be part of it.
License
Most photos seem to be CC-BY by default.
<http://www.geograph.org.uk/faq.php#opensource>
Download
No bulk download facility.
Free Download
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This Flickr data set contains over 2,000 downloaded images from 52 different groups. The information can be utilized for image content analysis in issues related to rich social media. Each image is indexed by its Flickr photo id and the corresponding group to which it belongs. Citation: Choudhury, M. D., Sundaram, H., Lin, Y-R., John, A., and Seligmann, D. D. (2009). ...
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Description “This system of 50 symbol signs was designed for use at the crossroads of modern life: in airports and other transportation hubs and at large international events. Produced through a collaboration between the AIGA and the U.S. Department of Transportation, they are an example of how public-minded designers can address a universal communication need. ...
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From the website:
> This project aims to create an archive of user contributed clip art that can be freely used. All graphics submitted to the project should be placed into the Public Domain according to the statement by the Creative Commons.
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About > The JCB DataViewer is a browser-based application for viewing original image files – from various types of microscopes and gel-documentation systems – associated with JCB articles. It is the first browser-based system for viewing multi-dimensional light microscope image data. Openness Not [open](http://opendefinition.org/) due to noncommercial ...