OOMEGA supports various persistency solutions out-of-the-box.

Versant Object Database: The Versant binding is suitable for high performance object persistence in central data repositories.
Hibernate: We do also support Hibernate to store objects in existing relational databases.
db4objects: db4objects is supported to persist objects in an embedded database system.
MemoryDB: Finally OOMEGA offers an in-memory/file-based object database which is called MemoryDB.