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Wikimedia Commons

As the name suggests, Wikimedia Commons is a well-indexed and huge collection of files. You can use the media files freely. While the Terms of Use describe complicated exceptions and attribution rules, a pop-up box showing that you need to attribute an author appears when you click to download an image. Then, follow the guide for the attribution process.

On the downside, the available images are not necessarily high resolution. But if you search featured pictures, you’ll find choice high-resolution images.