Base UI Sketch Framework - Huge set of everything you need to design and prototype
Sketch 42 - Now with export presets, touch bar integration, and more
INSTAD.IO - Automagically converts vector images into sketchy style
Anima App - Design, get feedback, convert to code, publish, iterate.
Graphcool - The GraphQL backend for mobile & web developers to build better apps faster ⚡️
Sketch Repo - Collection of resources for anyone who uses Sketch