What are some alternatives?
Flaticon - A database of free vector icons.
Unsplash - Unsplash is a website with high-quality free HD images. It has a catalog of more than three hundred thousand striking images that are neatly organized with tags. Read more about Unsplash.
Snapixen - Snapixen is a website where you can upload any image you want.
Pixabay - Over 270,000 free photos, vectors and art illustrations
Pexels - Find the best free stock images about Browser Home Page. Download all photos and use them even for commercial projects.
TurboSquid - TurboSquid offers 3D models for professionals.