Object database systems
\zline{\fbox{C++}}- ObjectDesign \zline{ObjectStore}
- Ontos \zline{Ontos Inc.}
- Objectivity \zline{Objectivity Inc.}
- O2 \zline{O2 Technology}
- GemStone \zline{Servio Corp.}
- Versant ODBS \zline{Versant \c{Object Technology}}
Research
- OBST -- Stone \zline{ftp.fzi.de}
- ODE/O++ -- AT&T \zline{netlib.att.com}