Previewed - Beautiful mockups & graphics for your next app
Easy Mockup Figma Plugin - The easiest way to create mockups in Figma
Design Camera - Drag and drop 3D mockups
Screenspace - ScreenSpace empowers app companies to showcase their products with the power of 3D device videos.
Morflax studio - 3D design platform on the web
The Mockup Club - Get the best design mockups for free