Open source transactional distributed database
Toolkit for working with and mapping geospatial data
A powerful, cross platform, SQL database system
Relational Database
An object relational-mapping (ORM) library for Java
Database Replication, Filtered Synchronization, and Transformation
Version Control for your Database
Java Application Framework
DAO for all database server types with the Java POJO code generator
a set of foundation classes for database engines
Relational database replication tool based on XML Schema
Qvu Data Service is an ad-hoc query, reporting and api data service
eXist-db is a feature rich Open Source native XML database
Rel is a database management system (DBMS) that implements Tutorial D.
CAM XML Editor for XML+JSON+Hibernate+SQL Open-XDX sponsored by Oracle
World's first open source data quality & data preparation project