Real-time(RT) Embedded DBMS
Empress RDBMS is a full-featured database engine designed for embedded, real-time applications.
Real-time Studio by ARTiSAN Software ~ Real-time UML Modeling Tool for Realtime Embedded Development
Real time software tools and platforms for control systems and embedded systems from RTI
The Open Source embedded database system Berkeley DB
McObject - Precision Data Management: The eXtremeDB Main Memory Embedded Database for Smart Devices
Pervasive embedded data management solutions ( Pervasive.SQL 2000i)
iAnywhere Solutions Embedded Database Technology
KEmbeddedDataBase (KEDB) is a small hierarchical database for Qt/Embedded based PDAs.