Datomic - The fully transactional, cloud-ready, distributed database
Facebook Design - Devices - Images and Sketch files of popular devices.
Datahike - A durable datalog database adaptable for distribution.
Device Shots - Generate high-resolution device mockups using a screenshot.
MarkLogic Server - MarkLogic Server is a multi-model database that has both NoSQL and trusted enterprise data management capabilities.
Clay Mockups - Free set of beautiful device mockups for your designs