Mixkit - High-quality stock videos that are completely free.
MockMagic - A free, easy-to-use device mockup generator
Stampede it! - Free audio & video assets for your design projects.
Dimmy.Club - Device mockup generator for your website and app screenshots
Music For Makers - Licensing good music has never been this easy.
Mockup Generator by Pixeltrue - Create beautiful product mockups in just a few clicks