OpenQM is an open-source multi-value database management system.
OpenQM was first developed in 1993 as an in-house embedded database.
Multi-Value
http://www.openqm.com/
http://downloads.openqm.com/help/index.html
Ladybridge Systems
GB
1993
Commercial, Open Source
AIX, BSD, Linux, Solaris, Windows
GPL v2, Proprietary