Some popular free stock photography sites include Unsplash, Pixabay, Pexels, Burst (by Shopify), Picjumbo, Reshot, and StockSnap.io - each site has their own unique collection of images and technology to identify creative-commons commercial use applicable images. However, they're not always perfect. HubSpot's Free Stock Photo Downloads have no royalties, no fees, and free to be used for any purposes.