TOAD (Tool for Oracle Application Developers) http://www.quest.com/toad ，The most popular of all the PL/SQL IDEs, TOAD is famous for its tabbed browser and "Swiss Army Knife" approach. Available in both commercial and freeware versions.
SQL Navigator http://www.quest.com/sql_navigator，Also from Quest, this IDE has been around a long time—and it shows in the depth of its
support for PL/SQL and Java programming in the database.
PL/SQL Developer ttp://www.allroundautomations.nl/plsqldev.html，A fine and relatively inexpensive entry from the Netherlands, PL/SQL Developer offers a large number of features in a very nicely designed package. It also allows third-party developers to provide plug-ins to extend the base product's functionality.
TOra (Toolkit for Oracle) http://www.globecom.se/tora/ ，This toolkit includes a browser, PL/SQL editor, and debugger for Linux or Microsoft
Windows. TOra is available in open source and commercial forms.
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