Raven is an Open Source (with a commercial option) document database for the .NET/Windows platform. Raven offers a flexible data model design to fit the needs of real world systems. Raven stores schema-less JSON documents, allowing you to define indexes using Linq queries and focus on low latency and high performance.
RavenDB has its own website. Please go to ravendb.net to see all the details.
Forget about tables, rows, mappings or complicated data-layers. RavenDB is a document-oriented database you can just dump all your objects into. Queries are amazingly fast and flexible.
Sharding, replication and multi-tenancy are supported out-of-the-box. Scaling out is as easy as it gets.
ACID transactions are fully supported, even between different nodes. If you put data in, it is going to stay there. We care about your data and we keep it safe.
RavenDB is a very fast persistence layer for every type of data model. Skip creating complicated mapping or multi-layer DALs, just persist your entities. It Just Works, and it does the Right Thing.
Built with extensibility in mind, RavenDB can be easily extended via bundles. Many integration points ensure you can always squeeze more out of RavenDB. You aren't shackled to a One Size Fits None solution.
Every bit of code was carefully considered. RavenDB was designed with best-practices in mind, and it ensures that everything Just Works.