Freerange Stock
Minimography
Gratisography
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Morgue File
Pixabay
all images uploaded here before 09 Jan 2019 have a public domain license and those images can be used without a license and without attribution; the site/content was purchased by Canva on 09 Jan 2019 and started issuing their own licenses, but they could not legally revoke the public domain status of images uploaded prior to 09 Jan 2019, so those images are still in the public domain
Unsplash
Shutterstock
they actually have a free photo section; some images are for editorial use only, which means they cannot be used for commercial purposes, so make sure you check the licensing for any free image you intend to use commercially
RGB Stock
Skitterphoto
