Eclipse SQL Explorer is a thin SQL client that allows you to query and browse any JDBC compliant database. It supports plugins with specialized functionality for individual databases (Oracle, DB2 and MySQL) and can be extended to include specialized support for other databases.
dbdeploy is a Database Change Management tool. It helps developers and
DBAs change their database in a simple, controlled, flexible and
frequent manner
As an FAQ you can easily navigate to the sections of interest. It is recommended to start with the NLS_LANG Parameter Fundamentals section first to get a basic understanding of how the NLS_LANG parameter works.