An academic project object repository (means e.g. no query language) with typed objects and a hierarchical namespace for C++ and maybe other languages. Serves as low-level storage infrastructure for more advanced database projects. Successor of EXODUS...
LDB is a free object-oriented database management system built on top of SHORE 2.0. It supports ODMG ODL specifications and can handle most ODMG OQL queries using a query optimizer. [Open Source but copyrighted]