Ungraded is described as 'drone stock footage' and is an website in the Video & Movies category. There are more than 50 alternatives to Ungraded, not only websites but also apps for a variety of platforms, including Windows, iPhone, iPad and Mac. The best alternative is CC Search, which is both free and Open Source. Other great sites and apps similar to Ungraded are 500px (Freemium), Pixabay (Free), Pexels (Free) and Shutterstock (Paid).
PhotoDune is part of Envato Market. At PhotoDune you can buy and sell royalty-free photographs and images starting at just $1. Items are priced on the size/megapixels of each file; the total price also includes a Buyer Fee.