Good Free Photos - Large free stock photo site with thousands of public photos
The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.
WallpapersCraft - HD & 4K wallpapers
PublicAPIs - Explore the largest API directory in the galaxy
Unsplash - Unsplash is a website with high-quality free HD images. It has a catalog of more than three hundred thousand striking images that are neatly organized with tags. Read more about Unsplash.
API List - A collective list of APIs. Build something.