Sketch Mirror - Preview your iOS designs directly on your devices
42matters Explorer - Explorer by 42matters is a research tool to visually explore databases of apps, publishers, audiences, SDKs, technologies, contacts and others.
Flowkit - Sketch library for user flows/content maps/annotations
Gravatar - Gravatar (an abbreviation for globally recognized avatar) is a service for providing...
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.
TryMason.com - Make front-end features, faster