Sketch 42 - Now with export presets, touch bar integration, and more
Sketch Extensions - An official collection of Sketch extensions & plugins
Anima App - Design, get feedback, convert to code, publish, iterate.
Base UI Sketch Framework - Huge set of everything you need to design and prototype
Sketch Repo - Collection of resources for anyone who uses Sketch
SketchTool - Export pages & slices out of .sketch docs using CLI