An Object-oriented system for persistent storage.
The home page can be found at http://coldstore.linuxbox.com/.
A list of freely available databases.
The home page can be found at http://www.iam.unibe.ch/~scg/Archive/Software/FreeDB/.
Databases: Mapping Objects to Relations.
The home page can be found at http://mini.net/cetus/oo_db_systems_3.html.
Index of publicly available database software.
The home page can be found at http://www.acm.org/sigmod/databaseSoftware/.