unDraw

“Create better designed websites, products and applications. Browse to find the images that fit your messaging, automagically customise the color to match your brand and use it as a normal image, embedded code or directly in your design workflow.”

https://undraw.co/

NASA Image and Video Library

You can browse NASA’s Image and Video Library online; you can also access it via NASA’s API. Through that interface, you can search by caption, keyword, location, photographer, year created, and other fields; in return, you get structured data on each media file. The library was launched two years ago, bringing together more than 140,000 images, videos, and audio files that had previously been spread across dozens of separate collections.

https://images.nasa.gov/