Anima App - Design, get feedback, convert to code, publish, iterate.
Sketch Extensions - An official collection of Sketch extensions & plugins
Timeline for Sketch - Create beautiful timeline animations in Sketch
Sketch Repo - Collection of resources for anyone who uses Sketch
Invision - Prototyping and collaboration for design teams
Framer Inventory 3 for Sketch - Import states & export prototypes from Sketch to Framer