BaseX is a light-weight, high-performance and scalable XML database system and XPath/XQuery processor, including full support for the W3C Update and Full Text extensions. The issue tracker has been moved to https://github.com/BaseXdb/basex/issues
ConStore is a light-weight model-oriented storage facility for concept networks (Concept-Nets) with seamless object-oriented programming interface. Concept-Nets can be viewed as arbitrary graphs where the vertices as concepts and the edges as Relations.
idyuts is \"I Dare You to Use This Shell\"; a pre-hibernate approach to replacing an ORM written with jython functors into a pure-Java language command pattern. The \"pipeline codegen artifacts\" are simple IoC templates, and trivial to adapt
Slumber is an extremely light-weight and easy-to-use Object-relational mapper. It simply maps data from a JDBC result set into an object structure defined by java annotations.