Be sure to limit to images that are openly licensed for reuse; see the Creative Commons page for more information on licensing terms that are frequently used.
Allgo Plus-Size Free stock photography collections featuring plus-size people: License: Attribution is not required.
Bing Images lets you limit results to creative commons licenses.
Disabled and Here Free stock photography featuring disabled BIPOC (Black, Indiginous, people of color), varied body sizes/types, sexual orientations, and gender identities in the Pacific Northwest; License CC BY 4.0.
Flickr hosts millions of Creative Commons-licensed images. Notably, Flickr provides a separate Creative Commons licensed videos collection
Gender Spectrum Collection Free stock photos of trans and non-binary people, licensed CC BY-NC-ND 4.0
Google Images provides a filter to limit to creative commons images.
Images of Empowerment Free images of women's lives and work, created by the William and Flora Hewlett Foundation, the David and Lucille Packard Foundation, and Getty Images; License: CC-BY-NC-4.0
Getty Open Content contains all images of public domain artworks in the Getty's collections. These high-resolution images of the Museum's collection free to use, modify, and publish for any purpose.
Nappy Free high-resolution photos of black and brown people, licensed Creative Commons Zero (CC0)
PICNOI - Free photos of people of color; no attribution required but can give credit by linking to site
Redefining Women Icon Collection - Icons of women; License: Creative Commons Public Domain CC0 1.0
Smithsonian Open Access provides free access to nearly three million 2D and 3D digital images from the Smithsonian's collection to download, share, and reuse. No permission required.
Wikimedia Commons is a media file repository that is completely dedicated to providing educational media that are released either in the public domain or under Creative Commons license.