OpenBrand - OpenBrand helps designers, agencies, and brands work together. It is a smart home for all your logos, designs, and other creative stuff.
Sketch Mirror - Preview your iOS designs directly on your devices
Brandy - Keep brand assets in sync with your team and right at your fingertips for quick use.
Flowkit - Sketch library for user flows/content maps/annotations
PSDETCH - Open design files like PSD, PDF, Images. Extrating layers, measuring distance, comparing difference, commenting, revision -- All cool features for developers working with a design file.
Figma Mirror - Figma Mirror is an application that covers top trending designing or sketching ideas making your teamwork in a single environment and design better products from start to finish.