Git Sketch Plugin - Version control for designers
Fluid for Sketch - Sketch plugin to make your responsive designs more efficient
Floverview - Hybrid mapping for flow overviews
Sketch Plugin Course by Design+Code - Enhance your design workflow by creating a Sketch plugin
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
Select Similar Layers - Sketch plugin to select layers with the same attributes