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Deductive Database with Datalog, SQL, RA, TRC, DRC
The Datalog Educational System (DES) is a deductive database with Datalog, SQL, Relational Algebra, Tuple Relational Calculus and Domain Relational Calculus as query languages developed mainly for education. It can be used from most common Prolog interpreters over any supported OS and from portable executables (Windows, Linux and MacOS).
WhiteBear is a set of foundation classes for database engines written in Java. It supports object and relational database, is highly portable and may be used in embedded or server environment. Project has been created from scratch and plan to includes storage engine, server, SQL interpreter, ODBC, JDBC and JDO interface
SimpleSQL is a 64-bit relational database, works as a standalone server-free db. component and transactional db. server, with standard SQL and JDBC, has portable single db. file, first db. available in Java and C++.
XML database engine for mobile devices (iPaq, Palm, etc.). The core of the system is Java based, this way it makes it portable and able to run on different systems. It's very lightweight and runs on devices with little memory and storage place.