Oracle - SQL Developer

Oracle SQL Developer
Oracle SQL Developer is a new, free graphical tool for database development. With SQL Developer, you can browse database objects, run SQL statements and SQL scripts, and edit and debug PL/SQL statements. You can also run any number of provided reports, as well as create and save your own. SQL Developer enhances productivity and simplifies your database development tasks.

SQL Developer can connect to any Oracle Database version 9.2.0.1 and later and runs on Windows, Linux and Mac OSX.

SQL Developer is free.