Sketch Repo - Collection of resources for anyone who uses Sketch
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
Auto-Layout for Sketch - Responsive design for Sketch
EasyAppIcon - EasyAppIcon helps you to create your own app icons easily. Supporting Android Adaptive Icon!
Symbols for Sketch - A set of templates to make an icon font with Sketch (gulp)
App Icon Maker - Create icons for mobile app stores online for free.