An open source object database?

Question

Is there an open source object database available? I would like to look at the source code and see how the materials are implemented.

Answer 1

http://www.zope.org/Wikis/ZODB is the first thing that comes to mind, but here is a list of commercial and open source objects:

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

Answer 2

db4o is my favorite.

Answer 3

, Magma, Smalltalk OODB, Gemstone.

Magma - OODB Squeak Smalltalk. . http://wiki.squeak.org/squeak/2665. , . , .

Gemstone is perhaps the largest OODB company, with the best track record. They used to be very expensive, but recently they introduced the free open source version for small (4 GB) databases in their GLASS applications (Gemstone, Linux, Apache and Seaside).

Answer 4

Prevayler is one of them.

Answer 5

CouchDB is a document database, almost the same as one.