Select Similar Layers - Sketch plugin to select layers with the same attributes
Device Shots - Generate high-resolution device mockups using a screenshot.
Framer Inventory 3 for Sketch - Import states & export prototypes from Sketch to Framer
shotsnapp - Create beautiful device mockup presentation
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Base UI Sketch Framework - Huge set of everything you need to design and prototype