Sav ZBase is a Java-coded ORDBMS supporting graphic user interface (GUI) for the work with database by means of Zigzag language, more expressive than SQL and XQuery. Algebraic expressions of Zigzag allow simultaneously to process tabular data and hierarchic, like XML, with dynamic and multilevel structure. The some peculiarities of database: many-valued data, multi-level classification, dynamic structure, class inheritance, and automatic data integrity control. Product consists of the next tools: 1. ZInterpreter. A development tool for Zigzag language programming of a database. Helps to edit and debug a Zigzag script. 2. ZNavigator. Allows generating virtual tables via attribute names and values.