Git Sketch Plugin - Version control for designers
FlexboxPatterns - Build awesome user interfaces with CSS flexbox
Fluid for Sketch - Sketch plugin to make your responsive designs more efficient
Webflow Flexbox UI Builder - Build flexible, responsive layouts — without writing code
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
Supernova Studio - The world’s first true design-to-code platform 🚀