Select Similar Layers - Sketch plugin to select layers with the same attributes
Git Sketch Plugin - Version control for designers
Framer Inventory 3 for Sketch - Import states & export prototypes from Sketch to Framer
Anima App - Design, get feedback, convert to code, publish, iterate.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Marvel for Sketch - Sync, play and record prototypes in Sketch!