Rackspace - More than 100,000 businesses trust Rackspace with their hosting and cloud computing. Get cloud, managed and hybrid hosting all backed by Fanatical Support.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Apache Drill - Schema-Free SQL Query Engine for Hadoop and NoSQL
Riak - A distributed, decentralized data storage system
Amazon AWS - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
DynamoDB - Amazon DynamoDB is a fast and flexible NoSQL database service for all applications that need consistent, single-digit millisecond latency at any scale. It is a fully managed cloud database and supports both document and key-value store models.