XDb 1.8.8

the author of this app says:

This object-oriented database for Windows and Pocket PCs gives you the power to represent and manipulate complex data in a manner unparalled by traditional database technologies.

Instantiate, reference, cut, copy, paste, edit and delete objects with an Explorer-like interface. The tree, grid and context menu interfaces facilitate data navigation and manipulation.

This is based on objects and their relationships. Each object has a unique ID that is automatically generated by the database. Each object is the instance of a class that defines its general characteristics. Instances can have the same, fewer or more properties than defined in its class. Each object inherits properties of its ancestor classes. Each object's data type is variant. Objects can be attached directly to others, giving you the flexibility to model the real world more accurately and intuitively.