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.
- http://www.dbis.informatik.uni-frankfurt.de/REPORTS/GOODSTEP/goodstep.html

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]
- http://lambda.uta.edu/ldb/doc/

Arcus
- Project researches on architecture for business information systems with a focus on object oriented architecture of client/server applications.
- http://www.objectarchitects.de/arcus/

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. [O
- http://www.cs.wisc.edu/shore/