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db4o open source object database, native to Java and .NET
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db4o Download Center

db4o Database Engine | Object Manager | db4o Replication System dRS

db4o Database Engine


Stable Release
db4o 6.4 - recommended for use in product shipment

Production Release
db4o 7.4 - Candidate for stable, ideal for evaluation and product development

Development Release
db4o 7.6 - Beta release, ideal for testing new features 

Continuous Build
db4o x.x - Released every 2 hours


Object Manager (OM)


Choose the version that matches your db4o release:
om 6.4 | om x.x

Starting with Version 7.0 there is a commercial-only version, ObjectManager Enterprise:

ome 7.0 


db4o Replication System (dRS)


Choose the version that matches your db4o release:

dRS 6.4 | dRS 7.2

 Most Downloads | Most Popular | Most Recent | Most Comments

Most Downloads

File Date Added  
db4o 6.4.54.11278 for Java
~23 MB db4o-6.4 for Java

 2007-09-18 Download
ObjectManager GUI Administration Tool - 6.1.604
1.89 MB - ObjectManager GUI Administration Tool

 2007-01-24 Download
DB4o Eclipse Plug In - Documentation

 2006-07-04 Download
ObjectManager 1.8 for Windows (no Java VM)
(~4,500 KB) Designed for db4o 5.5.

 2006-05-14 Download
ObjectManager GUI Administration Tool 6.4.14.8131
(~1.9 MB) Designed for db4o 6.4

 2007-09-18 Download
ObjectManager GUI Administration Tool - 6.0.200
ObjectManager 6.0

 2006-11-14 Download
Db4o Eclipse V0.2
Eclipse PlugIn for db4o management in the eclipse ...

 2006-10-09 Download
db4o 6.1.604 for Java
~9.6 MB - db4o 6.1 for Java

 2007-01-24 Download
db4o 6.4.54.11278 for .NET 2.0 (.msi installer)
~7.7 MB db4o-6.4 for .NET 2.0
 2007-09-18 Download
Db4o Eclipse V0.1
Initial version of the Db4o Eclipse Plugin. Db4o E...

 2006-09-26 Download
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New to db4o?

Start with the current db4o Production Version 7.4 - a free, full, and unrestricted version of db4o's powerful object database engine.

For a download without registering, please visit db4o's website.

Licensing Information

Free General Public License
db4o is licensed under the GPL by default.
The GPL license is ideal if you plan to use db4o in house or you plan to develop and distribute your own derivative work as free software under the GPL as well.
Commercial License
A commercial license is required if you want to embed db4o in a commercial non-GPL product. Commercial licensees gain access to premium services and support.
"Open" Third Party distribution
db4o's distribution can be found in the folders labelled "db4o". They include db4o's object database engine (in different versions), the ObjectManager and the db4o Replication System (dRS). All of these are referred to as "db4o" in the above statement.

Third party products in this download center are listed in folders labelled "Open". They are not part of db4o or considered distributed by db4objects. When you download third party, "open" software, you accept the license agreement of the respective owner.