db4o

db4o open source object database, native to Java and .NET. Its power comes from allowing arbitrarily complex, application defined, class models to also represent your database schema.

• Support for Mobile
• First embedded DB to support LINQ
• Full support for Compact Framework plus Sync capabilities
• Compatible with ADO.NET DataServices API
• Object persistence out-of-the-box
• Free Object Manager plugin for DB exploration (OME)
• No schema mapping complexity
• Zero Administration
• Replication
• Embeddable
• Native Queries