NoSQL database engine light, portable and fast. Orient DB is a Document Database with the support of ACID Transactions, SQL and Native Queries, Asynchronous Commands, Intents, and much more.

The new OrientDB comes to life from the experience of about 10 years in research and development of Orient ODBMS. After 10 years the engine has been completely rewritten in Java as Document Database offering much more features and the same main goal: Extreme speed.

Deeply scalable Document based DBMS. It's the basic engine of all the Orient products. It can work in schema-less mode, schema-full or a mix of both. Supports advanced features, such as ACID transactions, indexing, fluent and SQL-like queries. It handles natively JSON and XML documents.
1. Extremely light: about 1Mb for the full server.
2. Runs on any platform: All the engine is 100% pure Java and can run on Windows and Linux and any system that supports the Java 5+ technology (The Orient Server component needs Java 6+).
3. Super fast: On common hardware* stores up to 150.000 (one-hundred-fifty-thousands) records per second, 13 billions per day.
4. Transactional: Compliants with ACID tests, supports Optimistic (MVCC) and Pessimistic transaction modes
5. Local mode: Direct access to the database bypassing the Server. Perfect for scenarios where the database is embedded.
6. Easy Java APIs: Learn how to use it in 15 minutes.

The license of this software is Freeware, you can free download and free use this database management software.