Toolkit for working with and mapping geospatial data
Database Subsetter and Relational Data Browser
CAM XML Editor for XML+JSON+Hibernate+SQL Open-XDX sponsored by Oracle
World's first open source data quality & data preparation project
Helping users to quickly understand SQL queries
Database SQL, query tool, using JDBC for Oracle,SQLite,PostgreSQL,etc
Data quality analysis, profiling, cleansing, duplicate detection +more
Database explorer to MySQL, Oracle, Sybase & others. Source maker JSF.
Database to Excel Extractor
Open source Extract Transform Load engine written in Java
A tool to convert Excel sheets into SQL code
A UI tool for any database
although fully functional, this is a pre-framework that you can extend