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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.
Persitancy api simaler to Prevailer but with more transparancy and less intrusiv to how you can disign your data structure. It uses a bytecode enhancer to add needed code to have your object presited betwhen sessions.
zTable is a mini-DBMS written in Java. It has 2 parts: a back-end DBMS engine and a front-end Eclipse editor plugin. The engine can be embeded in any Java application. The Eclipse editor can be useful as a free DBMS for end-users.