ConceptBase - ConceptBase is a multi-user deductive object manager mainly intended for conceptual modeling and the coordination of design environments. The system implements a dialect of Telos which amalgamates properties of deductive and object-oriented languages.
Data Warehousing Information Center - provides information on tools and techniques to design, build, maintain, and retrieve information from a data warehouse.
PostgreSQL - Object-Relational DBMS derived from the Berkeley Postgres system.
Quality Systems & Software - maker of a database-like system specially designed to manage interlinked trees of user, system, and software requirements.
TREND Information System - uses multi-dimensional structures to provide easier development and data access than conventional file/record-based systems.
Triton OODBMS - an object-oriented database system that was developed as part of the DARPA sponsored Arcadia environments project
Vodak - research prototype of an open object-oriented database system which can be tailored to specific application needs.