Neovidya - Neovidya provides structured access to high-quality educational content.
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.
Flowkit - Sketch library for user flows/content maps/annotations
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.
Sketch Tricks - Articles for Sketch
Universe Design System - Supercharge your UX & UI Design workflow. Made for Sketch.