Object Databases
Object Database:
An object database (more correctly referred to as ODBMS or OODBMS for Object DBMS or Object Oriented DBMS, respectively) is a DBMS (database management system) that stores objects as opposed to tuples or records in a RDBMS (Relational Database Management System) or record-based DBMS. As data is stored as objects it can be interpreted only using the methods specified by its class. The relationship between similar objects is preserved (inheritance) as are references between objects.
From: en.wikipedia.org/wiki/OODBMS
ConceptBase
ConceptBase is a multi-user deductive database system with an object-centered data model. Its ability to represent information at any abstraction level (data, class, meta class, meta meta class, etc.) makes it a powerful tool for meta modeling and engineering of customized modeling languages. The system is accompanied by a highly configurable graphical user interface that builds upon the logic-based features of the ConceptBase server.
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