Auto Draw: Drawing tool that can help create images
Pixabay: Free images that can be used without citing permission and credits
Unsplash: Free images and photos that you can download and use
Pexels: Free stock photos you can use everywhere. ✓ Free for commercial use ✓ No attribution required.
PikWizard: Free stock photos for commercial and editorial use
Brush Ninja: Animated Gif Creator