Amazon DynamoDB - Amazon DynamoDB is a fully managed NoSQL database service offered by Amazon.
Datomic - The fully transactional, cloud-ready, distributed database
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Google Cloud Datastore - Cloud Datastore is a NoSQL database for your web and mobile applications.
memcached - High-performance, distributed memory object caching system
Oracle TimesTen - TimesTen is an in-memory, relational database management system with persistence and...