Sketch + InVision - Design prototyping, collaboration & workflow for Sketch
Anima App - Design, get feedback, convert to code, publish, iterate.
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
Sketch Repo - Collection of resources for anyone who uses Sketch
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Git Sketch Plugin - Version control for designers