Anima App - Design, get feedback, convert to code, publish, iterate.
Select Similar Layers - Sketch plugin to select layers with the same attributes
Sketch Repo - Collection of resources for anyone who uses Sketch
Framer Inventory 3 for Sketch - Import states & export prototypes from Sketch to Framer
Auto-Layout for Sketch - Responsive design for Sketch
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.