SketchTool - Export pages & slices out of .sketch docs using CLI
Device Shots - Generate high-resolution device mockups using a screenshot.
Sketch Extensions - An official collection of Sketch extensions & plugins
shotsnapp - Create beautiful device mockup presentation
YayText! - ๐ข๐พ๐น๐ฎ๐ป ๐ฌ๐ธ๐ธ๐ต ๐พ๐ท๐ฒ๐ฌ๐ธ๐ญ๐ฎ ๐ฝ๐ฎ๐๐ฝ ๐ถ๐ช๐ฐ๐ฒ๐ฌ
Base UI Sketch Framework - Huge set of everything you need to design and prototype