RavenDB

Amazon WorkDocs is a file storage and collaboration service provided by global market behemoth Amazon. It's a direct competitor to the older and more popular Google Docs. Some notable customers

Qubit is a web personalization platform founded by former Google workers, using innovative technology to collect, store, process, and output data to optimize consumers' experiences on the

MongoDB is a document-oriented database tool that allows users to store objects into documents rather than tables. Since all of the data related to a single object can be found in its own document,

ArangoDB is software that combines multiple data models into a single database. Notable customers include Barclays, Thomson Reuters, Kabbage, MakeMyTrip, Karlsruhe Institute of Technology

Redis is a data structure store software that can be used as a cache, message broker, and database. It is open source and BSD licensed, which means that it's completely free to use and constantly

Couchbase is the NoSQL database for business-critical applications. Learn more.

RethinkDB is probably the most interesting new 'on-disk + complex queries' database out there. For sure made by people who get it. Salvatore Sanfillipo, creator of Redis. At NASA, RethinkDB

Home page of The Apache Software Foundation

The following drivers are available from the download page:

Amazon DynamoDB is a nonrelational database for applications that need high performance at any scale.

High-performance native XML database engine and all-in-one solution for building applications.