Big Sack: A lightweight Java Key/Value store with undo and disk cache.
Database to Excel Extractor
Object relational mapper
Automatic Database Migration Tool
"Database to CSV" project stores/loads data between database and CSVs
Simple persistent framework
A very simple Email Extractor
Allows the editing of CSV files using SQL commands
Persism is a simple no nonsence ORM.
Convert MySQL dumps into PostgreSQL dumps
RMS is created in Java and still not completed, still working on it.
SqlObjects - SQL library for Java