Free photographs, vectors, illustrations and videos on the Pixabay website and app. All media is copyright free and you won’t need to give accreditation to anyone. They sponsor Shutterstock stock (a free site has to make its money somewhere, right?), so you might find paid images during a search, but all Pixabay-registered items are completely free in all sense of the word. They even have a highly reliable API – and it’s free, too.