First, this one seems to aggregate a tonne of free stock sources:
A list I will add to over time, in nothing more than alphabetical order:
- Canva – Post listing 74 free stock photo sites https://designschool.canva.com/blog/free-stock-photos/
- Death to the Stock Photo http://join.deathtothestockphoto.com/
- Foodiesfeed http://foodiesfeed.com
- Getrefe http://getrefe.tumblr.com/
- GoodFreePhotos https://www.goodfreephotos.com Open source, collected from a variety of sources, with accreditation (which can be rare)
- Gratisography http://www.gratisography.com/
- IM Free (requires attribution) http://imcreator.com/free
- ISO Republic http://isorepublic.com/
- Jay Mantri http://jaymantri.com/
- Little Visuals http://littlevisuals.co/
- Magdeleine http://magdeleine.co/
- New Old Stock http://nos.twnsnd.co/
- Picjumbo http://picjumbo.com/
- Picography http://picography.co/
- Public Domain Archive http://publicdomainarchive.com/
- Raumrot http://www.raumrot.com/10/
- Superfamous (requires attribution) http://superfamous.com/
- The Pattern Library http://thepatternlibrary.com/
- Unsplash http://unsplash.com/
Awesome post, thanks for sharing.