Base UI Sketch Framework - Huge set of everything you need to design and prototype
Design Systems Repo - A collection of design system examples and resources
INSTAD.IO - Automagically converts vector images into sketchy style
Lingo Sketch Plugin - A design system manager for Sketch
Graphcool - The GraphQL backend for mobile & web developers to build better apps faster ⚡️
Mobile Chat Kit - UI kits & sample apps for building in-app mobile chat