Opensource Object Database? [closed]

Question

Is there any open source Object Database available? I would like to have a look at the source code and see how stuffs are implemented.

Answer 1

db4o is my favorite.

Answer 2

http://www.zope.org/Wikis/ZODB is the first coming to mind, but here's a list of both commercial and open source object databases:

http://www.odbms.org/vendors.html