Website Image Sources (free / low-cost):

http://www.freedigitalphotos.net/ – Small images (suitable for websites) are free, larger images are paid. License: Check the Terms & Conditions before using any images.

http://www.freeimages.com/ – First part of the listing is for paid graphics from other suppliers. Second part starting with "Free ???? Images and Royalty-free Stock Photos " is the free images. License: Check the Terms & Conditions before using any images.

https://commons.wikimedia.org/wiki/commons:free_media_resources/photography – These are public domain pictures. Photographs and images are free, uploaded by users and donated to the public domain. License: Check the Terms & Conditions before using any images.

http://www.publicdomainpictures.net/ – These are public domain pictures. License: Check the Terms & Conditions before using any images.

https://www.pexels.com/public-domain-images/ – These are high quality public domain pictures. Some require attribution, some make it clear that no attribution is needed. License: Check the Terms & Conditions before using any images.

https://www.freepik.com/ – Free vector images, photos, PSD files, and icons. No attribution required for personal use, attribution required for commercial use. License: Check the Terms & Conditions before using any images.

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Please be aware that most "free" image sources cover their costs by displaying advertising. Many of the ads are from stock photo agencies or services that offer images on a paid basis. Some of the ads appear to be free photos -- be careful before using these. Be cautious when you download an image that you are still on the free images site -- read the license granted with each image you download.