Toolkit for working with and mapping geospatial data
Java persistence using JDO, JPA or REST
ETL engine based on Groovy
Database SQL, query tool, using JDBC for Oracle,SQLite,PostgreSQL,etc
Data quality analysis, profiling, cleansing, duplicate detection +more
Adhoc Data Exploration - Live & Easy
Database explorer to MySQL, Oracle, Sybase & others. Source maker JSF.
Open source Extract Transform Load engine written in Java
A tool to convert Excel sheets into SQL code
Small, fast Java library for reading and writing CSV files
although fully functional, this is a pre-framework that you can extend