The Style Inventory … gives you an overview of all your used styles and helps you to merge styles of similar layers into one. This repositiory also contains a few other helpful plugins.
Example: Duplicate Artboard (next to the current artboard)
This improves the built in behavior of artboard duplication in Sketch. If the selected artboard is in the middle of other artboards, all artboards on the right side will be shifted to the right before the artboard is duplicated. Requires any layer of an artboard to be selected.
Shortcut: shift + ⌘ + D
