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Offsite
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Description Landsat ETM+, TM, and MSS data are available from USGS for free. [Base data page](http://landsat.gsfc.nasa.gov/data/where.html) leads on to: <http://eros.usgs.gov/products/satellite/landsat_ortho.html> Not entirely clear from that page you can actually get bulk downloads from however bulk of landsat data is on [geotorrent](http://geotorrent.org/) ...
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Offsite
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Description “OpenAerialMap is an open collection of aerial photographs, collected into a single coherent view of the world.” Openness: OPEN License: Public Domain of CC Attribution. > "OpenAerialMap is a young project, and as such, many of the licensing restrictions are still being worked out. In the short term, all imagery uploaded to OpenAerialMap should be ...
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Offsite
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Earthmine offers a street-level imagery and 3D map data API. The earthmine API provides a highly customizable and programmatic interface to earthmine’s unique library of street level imagery and 3D data. Through a simple REST style web service, users can construct and submit requests to obtain multiple static images of a subject of interest or an entire panoramic scene, ...