Choosing the Right OODB Solution
- A short comparison of ObjectStore, Versant, Poet, and Objectivity mostly focusing on the evaluation criteria.
- http://archive.devx.com/dbzone/articles/sf0801/sf0801-1.asp

EyeDB
- ODMG 3.0 compliant DBMS (including OQL) with manipulatable classes, templates and triggers. Supports multi-database objects. C++ and Java bindings. [Free for educational purposes]
- http://www.eyedb.org

Cetus on Object-Oriented Database Management Systems
- Links to evaluations, benchmarks and products.
- http://www.cetus-links.org/oo_db_systems_1.html

Zope IndexedCatalog
- is an LGPL extension to the Zope DB that provides indexing and querying.
- http://async.com.br/projects/IndexedCatalog

GigaBASE
- Single-node DBMS with SQL-like query language, arrays, computed attributes and a C++ API. [Open Source]
- http://www.ispras.ru/~knizhnik/gigabase.html

ConteXt
- An object-based database management system optimized for user interaction instead of transaction processing. It includes a database browser providing secure access to its server across the Internet. C++ binding for several flavours of UNIX. [Source code f
- http://unixspace.com/context/

Orient
- ODBMS compliant with the ODMG 3.0 standard. It's available as Just Edition (for small applications) and Enterprise Edition with extra components for replication, load-balancing and fault-tolerance. Supports Windows and Linux. Free Just version available
- http://www.orientechnologies.com/

Generic Object Oriented Database Management System (GOODS)
- Fully distributed ODBMS using a fat client model. The client side contains an adaptation layer to enable language independence and metaobjects to represent different aspects of transactions and caching. Currently only C++ bindings. [Open Source]
- http://www.ispras.ru/~knizhnik/goods.html

ZOPE
- The Z Object Publishing Environment consists of an object database (ZODB) and application server (ZServer) written in Python.
- http://www.zope.org/

eXtremeDB
- Main memory database for embedded devices with no need for secondary storage persistency. Provides ACID transactions. Schema compiler generates object-oriented-like interface using C as target language. Available for Win32/Windows CE, QNX, VxWorks, Linux
- http://www.mcobject.com

Eaglehawk StrongBox
- Internet accessible object-oriented database that allows inherently secure remote access to (legacy) data from fixed and wireless devices. Also provides on-line schema evolution and access audit mechanisms.
- http://www.eaglehawk.com