Sketch Mirror - Preview your iOS designs directly on your devices
UI Garage - Specific mobile and web design patterns for your inspiration
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.
Muzli - UI/UX and Design Inspiration Chrome Extension
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.
Design Hunt - Curated design inspiration for everyone