Dataman is a fully multi-threaded database server and client API libraries in C, C++, Java, and a PHP module has now been added as well. This is a 'direct access' database, not a relational one. It emulates the verbs of the EDITOR language.
VDDBMS is a middleware for managing data sources (DBMS) from different vendors to form a virtual DDBMS. It supports fragmentation and replication. The core engine is written in C++. Binding for scripting language is available as well as network access.