Shore
An academic project object repository (means e.g. no query language) with typed objects and a hierarchical namespace for C++ and maybe other languages. Serves as low-level storage infrastructure for more advanced database projects. Successor of EXODUS. [Open Source with unclear support state]

Arcus
Project researches on architecture for business information systems with a focus on object oriented architecture of client/server applications.

GoodStep (General Object-Oriented Database for Software Engineering Processes)
Has extended O2 database with schema updates, versioning, rules, views and concurrency control. Added some software engineering tools and evaluated it in two case studies. ESPRIT-III Project 6115; ended in 1995.

Mood
Object-oriented client-server database allowing complex queries on material's data. Includes an object editor but no programming language mapping. [Open Source]

LDB
LDB is a free object-oriented database management system built on top of SHORE 2.0. It supports ODMG ODL specifications and can handle most ODMG OQL queries using a query optimizer. [Open Source but copyrighted]

VODAK
Contains a non-standard object model which distinguishes between types and classes. Has parameterized types, metaclasses and support for streaming data. Handles nested transactions. Partial C++ interface. [Open source for non-profit use]