Facebook Design Resources - A collection of free resources made by designers at Facebook
Framer Inventory 3 for Sketch - Import states & export prototypes from Sketch to Framer
Circular Design Guide - Toolkit that brings design thinking full circle
Select Similar Layers - Sketch plugin to select layers with the same attributes
Sketch Extensions - An official collection of Sketch extensions & plugins
Fluid for Sketch - Sketch plugin to make your responsive designs more efficient