The best alternatives to QuarkIQL are Icons8, Pika, and MyStockPhotos. If these 3 options don't work for you, we've listed a few more alternatives below.
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AuthKit— The world's best login box, powered by WorkOS + Radix
Quickly create beautiful website and device mockup from screenshot. Pika lets you capture website screenshots from URL, add device and browser frames, customize background and more
Mockover is a 3D mapper to place custom content onto the image. Turn any image into a custom, branded image by replacing parts of the image with your own content.