ContentReel by Microsoft is a top plugin and that's mainly because it lets you easily populate text layers with names, dates and more fields.
Figmotion helps you create simple animations directly in Figma without having to open Principle or Adobe After Effects.
Similayer lets you select layers based on their common characteristics and update them all at once.
Similar to Similayer, Rename It enables you to update the naming convention for your layers at once.
Roller compares your style library to your frames and finds inconsistencies within your designs.