Zoomstock is a visually organized search engine that currently indexes millions of photos and illustrations from top free stock photo websites.
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All available images are laid out in a fully navigable stack of grids, with related images close to each other.
Just zoom in on any image that's similar to what you're looking for to see more images like that.
On the outer layers you can make great strides when panning across the images. Then dive down to the bottom layer to fully explore all the images in that area.
This lets you search and explore stock photos with unprecedented speed and ease: