Previewed - Beautiful mockups & graphics for your next app
Mockup World - The best free Mockups from the Web
Design Camera - Drag and drop 3D mockups
Artboard Studio for Figma - A plugin to create mockups right in Figma
Morflax studio - 3D design platform on the web
Mockup Plugin for Figma - Huge collection of devices, branding and AI mockups