Vector Mockups Library - Free collection of mockups for Sketch, Figma & Photoshop
UserTest.io - User testing made simple. High-quality, affordable user testing solutions from real users, here in the UK. Improve your usability!
ScreenCube - Web-based app mockup toolkit
Youtube Notch Mode - Bring the magic of the iPhone X’s new display to YouTube
Frrames Mockups - Free vector window mockups for your presentations
shotsnapp - Create beautiful device mockup presentation