Shared Text Styles - Easily import and export your Text Styles in Sketch.
Base UI Sketch Framework - Huge set of everything you need to design and prototype
Framer Inventory 3 for Sketch - Import states & export prototypes from Sketch to Framer
Sketchapp TV - Create Awesome iOS Apps With Sketch
Flowkit - Sketch library for user flows/content maps/annotations
Icon Slate - Icon Slate lets you easily compose, import and export desktop icons in many formats.