Flowkit - Sketch library for user flows/content maps/annotations
OpenBrand - OpenBrand helps designers, agencies, and brands work together. It is a smart home for all your logos, designs, and other creative stuff.
Crystal: Sketch Mirror for Android - Crystal: Sketch Mirror for Android is an application that is designed for viewing your sketch designs in real-time, navigate prototypes and download content related to the sketches for offline viewing.
Brandy - Keep brand assets in sync with your team and right at your fingertips for quick use.
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.
Misheneye - Give your team access to your logos, colors, values, mission and more. Execute consistently.