- Info: Link
- Size: 2.8 Million Images
- License: Public Domain
- Link: https://www.si.edu/openaccess
- Size: > 1 Million Images
- License: Creative Common, Public Domain
- Link: https://unsplash.com/
- License: No attribution, non-commercial use. License
- Link: https://www.pexels.com/
- Size: > 80,000 Images
- License: Public Domain
- Link: https://www.photolib.noaa.gov/
- Size: > 1 million Images
- License: No attribution, commercial use. License
- Link: https://pixabay.com/
- License: Creative Commons Zero (CC0). License
- Link: https://negativespace.co/