I have recently stumbled upon a great resource page with the best plugins for Sketch App, one of my favorite design authoring apps out there (yes i've moved on from Photoshop).
Managing your plugins
Before you grab all these cool new plugins, you’re going to need something to manage and update them. So go grab Sketch Toolbox. It’ll do the heavy lifting of installing and updating each plugin for you.
1. Dynamic Button
Buttons. Every product designer creates them, but no design tool makes it easy for us. Dynamic Button addresses that problem, helping you make text-layer-based buttons on the fly, which just makes sense.
2. Content Generator
Content Generator lets you fill out your designs with names, bios, photos, avatars, placeholder text, and more—all in just a few clicks. Which makes it ideal for whipping up mockups without having to dig around for images online.
Like the name suggests, Duplicator duplicates things quickly and easily. Use this to create perfect grids, lists, and other repeated elements.
4. Sketch plugins by Cemre Güngör
This robust group of plugins comes bundled together in one happy family. You trigger each of the functions below with a simple keyboard shortcut.
The set includes:
Scales the currently selected object to half its current size. And it does it proportionally too, so there’s no weird distortion of the object.
Proportionally scales the currently selected object to double its size.
Paste and swap
Pastes the image in the clipboard into the position and dimensions of the currently selected object, then removes the object. Useful for swapping assets.
Pastes the image in the clipboard and masks it with the currently selected rectangle, sizing the image to fill the rectangle's dimensions. Useful for pasting avatar images into placeholder rectangles.
Makes the currently selected rectangle a transparent red and names it "Guide." Useful for spec sheets.
5. Sketch Measure
Sketch Measure helps you provide measurements and design specs. Great for handing off designs to developers to make sure margins, placement, and padding are all as you designed.