FaunaDB is an OLTP database for cloud environments.
Fauna was founded in 2012 by a team of ex-Twitter engineers to solve consistency vs scale tradeoff in distributed data infrastructure. FaunaDB in inspired by Calvin, and is the only commercial database system that implements that protocol till date.
Document / XML
FaunaDB is an indexed document store that allows access to the stored data using multiple models - relational, document, graph and key-value.
All OS with Java VM, Hosted