Many CC0 (public domain) and other flexible licenses. Make sure you know whether there's a model release for recognizable people. Hi-res public domain CC0 and CC BY photos from European photographers. No model releases. Search by text box or category. For online use, credit Image by For print, requested credit Image by alegri / Terms detail exact use.   
55mm Public domain CC0 photos for personal and commercial use, small collection. Note that they indicate "most" are CC0. No model releases. No search. About and License & Legal detail exact use.   
AllTheFreeStock Compilation of stock photo, music, video, and mockups that appears to be part of site owner's marketing effort. The site sometimes misidentifies Creative Commons licenses or lists incomplete information. Perform very rigorous due diligence if you select any media.  
Burst Stock photos free for commercial use. All public domain CC0. Attribution appreciated but not required - photographer info on each page. Public domain CC0 images submitted by site owner and his uncle; based in Germany. Search by category or text box. Photo results include metadata, and a rudimentary HEX color chip search. About and Licenses detail exact use. Small PayPal cup of coffee donations welcomed.  
Creative Commons-Search Links to sites with Creative Commons search tools. Search for free content in the public domain and under Creative Commons licenses. Good news: The Use for commercial purpose check box does not pull CC BY-Share Alike results.  
Death to the Stock Photo Copyright-protected images assigned to user for personal and commercial use. You must distribute their license with your adaptation and you cannot add additional restrictions or terms. Must sign up for free emails of photos sent by email. Photograph End User License details exact use. Model releases obtained. Search engine for European culture in music, photography, art, and fashion. Each item lists copyright status, many CC0. Text search, collections, and Explore menu are excellent. Can search text, images, video, sound and 3D. Terms & Policies details exact use.  
Detroit Stock City Vibrant of revitalized Detroit. Free for personal, editorial, and other non-commercial uses; limited alteration or modification. Attribution: Must credit the photographer and the DSC Collection. Contact for commercial purposes. Legal describes how to use content, including a useful flowchart. License details use.  
FFCU Free For Commercial Use - German-based public domain CC0 photos for personal and commercial use. No model release information, but most photos of people are not recognizable. Can search by keyword and browse categories. About and FAQ detail exact use. Photo sharing; search by Creative Commons license  
  --The Commons at Public domain images from dozens of museums, libraries, centers, and archives  
  --Library of Congress Stream at Selection of public domain images from the Library of Congress.  
  --Smithsonian Stream at Selection of public domain images from the Smithsonian. Food-only photos, all CC0. No model or property releases, some photos contain trademarked products, which can affect commercial use. No attribution required, but suggest ‘Photo by x’ with a link back to photographer's Foodiesfeed page. See License for exact details. International photo sharing; hundreds of thousands of images; photographer may require notification of use and credit. No credit required for commercial use, but for editorial use, include credit adjacent to content or in credits: "'s Member Name." Content Licence Agreement details exact use. Used to be stockxchng, now owned by Getty. Personal use; other uses unclear; based in Britain. Vector, photo, PSD files, and SVG icons. They created some vector art, vast majority of works pulled from third-party sources, so be sure to check the source site terms. Personal and commercial use. Terms of Use details exact use. Personal and commercial use, but no guaranteed warranties and no model releases. Must include credit to Terms of Use details exact use, such as no use in trademarks or patents.
Free Range Stock Photos Commercial and non-commercial use; must sign up. When possible, credit image "Photos courtesy of and copyright Free Range Stock (or, and/or the photographer's name. Licensing details exact use. Public domain CC0 images for personal and commercial use, photographers based in Poland. Search by keyword and category. Attribution requested but not required. No info on whether model releases have been obtained. Licensing/Terms of Use and FAQ detail exact use.  
Getrefe-Free Photos Mainly mobile user-uploaded royalty-free stock photography site with a Free Photos section. Based in Lithuania. Personal and commercial use, themes and templates also allowed. Check License for full details. Model releases not mentioned.  
Getty Open Content Programs-Search Hundreds of thousands of public domain digital images of paintings, illustrations, and photos from various Getty collections; 300dpi minimum. Be sure Open Content Images is selected as filter when searching. Open Content works display Download button beneath image. Must attribute works as: Digital image courtesy of the Getty's Open Content Program. See About for complete details.   
Good Free Photos Photos taken by Wisconsin photographer released into public domain, but no model releases. Suggested attribution to Search and categories provided. Some unique collections, such as fossils and crystals. Offers a photo request option. Terms and Legal Stuff details exact use.  
Good Stock Photos Photos taken by SparkFLow, all available for personal and commercial use. No model releases. Suggested attribution: link to Good Stock Photos. Search and categories provided. Some unique collections, such as fossils and crystals. See About for details. Photographer photos released with CC0 license. Contact for specific model release info. Suggest attribution to License details exact use.  
Images of Empowerment Getty-supplied 1,400 CC-BY-NC licensed photos of diverse narratives of working women globally. See Licensing for exact details and links for commercial use. Free commercial subset of site's photos, some web templates, and icons. Many photos are labeled Creative Commons, but be sure to click photo to see which license. Photos link to Flickr CC BY, ND, and SA content; results severely skew toward white, male, young, thin. Can search by category or text box. Be very careful about commercial use of the free content where model releases, publicity rights, and trademarks are germane.  
ISO Republic Artistic and staged photos, free for personal and commercial use. No model or property releases, some photos contain trademarked products/logos, which can affect commercial use. Photos of people not particularly diverse, some very gender-defined and sexualized. No attribution required, but preferred for commercial WordPress themes and web templates. Some prohibited uses. See Our License for details.  
JeShoots Public domain CC0 photos uploaded by Czech Republic photographer Jan Vasek. Search and categories available. FAQ details exact use.  
Kaboompics Free stock photos owned by Polish photographer Karolina Grabowska. Suggested credit:"Photo by Kaboompics" with link to or "Photo by Karolina Grabowska / Kaboompics" with link to Can be used commercially. Model release unknown. Search and categories available, also by color. Individual photos broken out by color palette. License & FAQ details exact use.  
Kave Wall Stock CC BY photos, images, and textures at decent low res. No search, but many categories; hi res for a fee.  
From Old Books Attribution-only license for scans from old and rare books.  
Life of Pix Public domain CC0 photos for personal and commercial use. No model releases. Can search by category or search text box. About details use. Hosted by Leery Advertising Agency in Montreal, Quebec, Canada. Also provides CC0 videos at Life of Vids.  
Looking Glass Public domain CC0 photos, personal and commercial use, relatively small collection, but photographer adds more monthly. Can search by topic. Based in Australia. Link back to site requested but not required. Terms of Use and About detail exact use. No model releases, but current collection doesn't have too many photos of people that would seem to require it. Be sure to check.  
MMT Public domain CC0 photos, personal and commercial use, small collection. Can search by topic or search text box. Attribution requested but not required. License and About detail exact use. No model releases, but current collection doesn't have photos of people. Millions of crowd-sourced CC BY-SHARE ALIKE geotagged photos. Photos captured walking, riding, or panorama using app. Visit How It Works for details. Used in OpenStreetMap, an open data editable world street map.  
Metropolitan Museum of Art Public domain CC0 search of museum works. Click Public Domain checkbox in Show Only section. Can also search using Creative Commons search. Attribution required and available as text or HTML. Some available at Internet Archive Metropolitan Museum of Art - Gallery Images.
Morguefile Personal and commercial use of hi-res stock and reference images all under standard license that allows remix, commercial use, and to combine photos with other content. No attribution required provided you alter the image. Model release information, if any, is on the photographer's account page. Sign up for free account.    
Nappy Diverse, culturally representative public domain CC0 images. Images uploaded directly and pulled from other sources. No model releases, so avoid the recognizable face. Attribution not required, but suggested from the photographer on the photo page: Photo by username from License details use.  
Negative Space Swiss-based site of public domain CC0 photos. Can search by category, color, or copy space position. Some photos available in camera raw. Model releases unclear. License details exact use.  
New Old Stock Volunteer-uploaded or website owner-uploaded public domain or no known copyright restrictions photos from Flickr's The Commons collections. To download, be sure to click caption link to open Flickr and not host's Tumblr page so you can determine full usage and attribution information from owner. Be very diligent on this site. No search, no tags.  
New York Public Library Digital Collections NYPL Public domain collections CC0  works. To search for public domain, enter a search term, then click the Search only public domain materials check box. Optional (but recommended) credit line: From the New York Public Library. Can also search using Creative Commonsearch  
Northwestern Univ. WWII Poster Collection Public domain scans of posters. Attribution required.  
Open Photo Personal and commercial use for Web/multimedia; images with Creative Commons licenses.  
Pexels Public domain CC0 photos uploaded by contributors. Search by category, text, and tags. Various sizes, including hi res available upon request. Attribution not required. No model releases, so avoid the recognizable face. License details exact use.  
PD Photo,org Public domain (majority) and copyrighted images.  
PhotoPin Searches Flickr Creative Commons licenses; can filter for commercial. HOWEVER, it does not distinguish between CC licenses, so be sure to check what it pulls, such as CC BY-NO DERIVATIVE or CC BY-SHARE ALIKE. Public domain CC0 photos uploaded by the site's owner. Search by category, text, and tags. Hi res photos available upon request. No model releases. Disclaimer details exact use. Photos free to use commercially by Czech Republic photographer Viktor Hanáček. Full search by category, key word, and tags. Attribution or link back to suggested. See FAQ and Terms for exact use. No model release, but no recognizable models. Premium subscription provides additional hi-res photos.  
Picography Free to use commercially. Small subset of premium image collection from Ireland-based web design company. Educational use only.  
Pikwizard Free to use commercially, including trademarks and other branding. However, mixed in are "Premium" Adobe Stock photos, no way to filter those out. No attribution required on their content. Standard License details use.  
Pixabay Public domain CC0 images uploaded by members. Users must perform their own trademark, model release, and property release research. The blog and Terms of Use detail exact use. Their Editor's Choice pages are fantastic. Public domain images uploaded by members. Link back suggested. Note that no model or property releases have been obtained.  
Public-Domain-Photos Public domain images, many from No model releases stated. Provides both search and categories.  
Reshot Images are protected, but users granted license to use commercially without attribution. View Packs for unique collections, very diverse. Model release information on each photo. See License and FAQ for details.  
Skitterphoto User-uploaded and tagged CC0 images. Search by category or admin-curated. Model releases unknown. Based in the Netherlands. See License and About Skitterphoto for details.  
Snapwiresnaps Subset of stock photo site. Curated collection of user-submitted CC0 stock images (no attribution required). Hi-res downloads, search based on photographer's tags, which are not visible. You can manually search through the pages, or search with expanded and repeated searches. No model release information. Amazing microscopic photos of snowflakes, frost, and things snow crystal. Personal use, blog use with link back, contact for commercial use. Copyright Questions details use.  
Startup Stock Photos Provides a library of “startup-focused” CC0 stock images (no attribution required). No search or categories, no model releases obtained. Free to use set of stock images (some hi res) from fee-based Royalty-free license allows commercial use, but you must sign up for free account and provide attribution and/or link back to website. For print materials, the license is good for 10,000 copies. Applies only to non-watermarked images. Check FAQ and Terms and Conditions (particulary the Royalty-free License section) very carefully, and contact them if you are unclear. Tens of thousands of images, some PD, but mainly with CC BY and CC BY-SHARE ALIKE licenses from Stock images of people are notably not diverse. Search and categories availablr. Click on image to view license and attribution information on original site. FAQ and Terms of Service detail exact use.  
StockPhotos For Free Free stock photos from hi res still frames for commercial & personal use; used to guide users to subscription-based videoblocks, which is where these images originate  
Stocksnap Curated collection of user-submitted CC0 public domain stock images (no attribution required). Hi-res downloads, search based on photographer's tags, so expand and repeat searches. About details exact use. Model releases do not appear to have been obtained.  
StockVault Personal & non-commercial only; be aware of barely distinguishable ad results with links to Shutterstock. Terms of Use details exact use.  
Sunipix Copyright-protected low-res images and vector art provided by the Abraham Thomas Foundation. Personal and commercial use allowed, can purchase hi-res. FAQ details specific (and generous) commercial uses of low-res images.  
Superfamous Studios CC BY images on website only of Dutch designer Folklert Gorter. Note that links for downloading hi-res goes to Flickr where images are licensed ©. Images tagged, but no search function.  
Unprofound Uploaded photos free for commercial use, but not updated in a few years. Can search by color. No model releases. FAQ details exact use.
Collection of unique hi-res CC0 stock photos. No attribution required, commercial use allowed. Sign up to receive 10 photos every 10 days or browse site. No tags or search. FAQs detail exact use.  
UKBlackTech-Stock Photos Small set of CC-A people of color in tech. Attribution: UKBlackTech or No model releases.
Unsplash CC0 public domain hi-res photos. Credit requested (Photo by [Name] on Unsplash) but not required. FAQ and License detail exact use. Photographers are responsible for model releases.  
Wikimedia Commons Personal and commercial open use images, music, sound & video clips; Creative Commons and GNU Free Documentation licenses or images are in public domain. Also recommend rigorous review of work before commercial use. Most CC licenses are CC BY-SHARE ALIKE. Does not appear that photographers obtained model releases. Can also search using "public domain" or "PD."  
WorldImages Nonprofit and educational use with attribution license.  
WOCinTech Chat Hundreds of awesome photos of mainly women of color showing a different representation of all women in tech: entrepreneurs, software engineers, infosec professionals, IT analysts, and marketers. All CC BY images on Flickr, model releases obtained. Project of Women in Color in Tech Chat.
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