SQuirreLSQLClient is a graphical SQLclient written in Java that will allow you to view the structure of a JDBC compliant database, browse the data in tables, issue SQL commands etc.
This project builds upon the MongoDB Java driver to provide a limited JDBC implementation to allow graphical tools such as SQuirreLSQLClient to visualize and manipulate MongoDB collections and documents. It will accept an SQL-like syntax for CRUD operations, where "tables" represent MongoDB collections, and rows are individual documents within a collection. Each row has two columns (ObjectId and Document).
DB Copy Plugin is a plugin for the SQuirreLSQLClient (1.2beta6 and 2.0 RC1+) that allows copying database objects (schema def and data) from one session window to another. The sessions can be disparate database vendors (Oracle -> MySQL, for instance).