Here is a collection of sites where you can download free stock photos to use on your personal and commercial projects. The majority of images require no attribution but make sure you read any licenses before using.
Pexels offers free stock photos & videos that you can use everywhere. Millions of high-quality royalty free stock images & copyright free pictures.
Unsplash offers free images and photos that you can download and use for any project. Better than any royalty free or stock photos.
Burst is a free stock photo platform that is powered by Shopify. Their image library includes thousands of high-resolution, royalty-free images.
Kaboompics photos are often seen somewhere online and even appeared on Netflix. All photos from Kaboompics can be used for free. Attribution is not required.
Freepik offers thousands of high-quality stock content images with free and premium licenses.