The best alternatives to Smithsonian Open Access are Pexels, Unsplash, and Icons8. If these 3 options don't work for you, we've listed a few more alternatives below.
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Imdownloader is an online tool that enables you to download images in bulk. It could run as Bulk image downloader, Google image Downloader, Pinterest image downloader and Instagram image downloader. It takes a few seconds to download all images from a URL.
Extract.pics is an easy to use tool that allows you to extract, view and download images from any public website. Simply paste the URL of the website into the input field and click "Extract" to start the process. completely free to use!