db4o Version 6 Beta Debuts
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| Users contribute code, ideas, bug fixes, and documentation to the
| software production, significantly increasing the productivity per
| dollar invested in the db4o platform.
|
| [...]
|
| "It's of crucial importance for commercial open source vendors to
| focus on the issues important to their community," explains Stephen
| O'Grady, senior analyst at RedMonk. "The db4objects community's priority,
| as it should be, has been on performance, and db4objects the
| company has accordingly invested heavily in speed with some
| compelling results."
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http://www.linuxelectrons.com/News/Application/db4o_Version_6_Beta_Debuts
They use dual licensing (GPL) for profit.
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