Piper
Oracle SQL processor tool for Windows (98,NT,2000). Piper facilitates monitoring and debugging PL/SQL application development with features such as HTML Output Previewer, Continuous Pipe Read capability, Catalog Browser, and Command History. By DataBeacon. [Freeware]

PL/SQL Developer
Single product that includes editor, and debugger. By Allround Automations. [Commercial]

SQL-Programmer
Cross-platform database aqpplication development environment, formerly sold by Sylvain Faust Software. By BMC Software. [Commercial and free versions]

Redwood Explorer
"Windows Explorer"-like tool for Oracle application developers. Includes PL/SQL editor. By Redwood Software Inc. [Freeware; commercial version available]

Material Dreams
PL/SQL trace tool, table exporter, session manager, shared pool profiler, and other tools. [Commercial]

pldoc
Open source utility, analogous to javadoc, that generates PL/SQL code documentation in HTML. [Open source, LGPL]

TOra - Toolkit For Oracle
Including browser, PL/SQL editor, and debugger for Linux or Windows. By Underscore AB. [Open source and commercial versions]

Bear Claw
Variety of products that extend PL/SQL functionality, providing utilities such as FTP, telnet, and ZIP file manager. Implemented as stored procedures. [Commercial]

SQL*Object Builder
PL/SQL editor, debugger, SQL execution plan analyzer. By IDB Consulting. [Commercial]

JoraclePro
PL/SQL editor, debugger, object navigator, command console. By Opensoft, Inc. [Commercial]

Software tool reviews for Oracle developers and DBAs
Semi-independent third-party review of various PL/SQL development products.

DBPartner for Oracle
Tune and debug SQL, PL/SQL. By Compuware. [Commercial]

Unicenter SQL-Station
Edit, test, tune, and debug SQL and stored code (works with Oracle, Microsoft and Sybase). By Computer Associates. [Commercial]

Quest Software
SQL Navigator, TOAD, Knowledge Expert, Formatter Plus [Mostly commercial; some freeware versions]

Log 4 pl/sql
Generic tool for logging, benchmarking, and monitoring custom PL/SQL code, inspired by "log4j" [Open source, GPL]

SQLTools
A light weight and robust tool for Oracle database development. It includes a text editor, SQL console and utilities. [Freeware]

OraTools
Execute, test, and debug SQL and PL/SQL statements. By Core Lab. [Commercial]

Oracle Developer Suite
Includes various PL/SQL code generators in "Designer" component, also PL/SQL Procedure Builder [Commercial]

Lecco SQL Expert
Development environment with special emphasis on SQL and PL/SQL performance optimization. By Leccotech. [Commercial]

ClearSQL by Nordic Tree Software
A tool for formatting PL/SQL source code and reviewing it for deficiencies in the areas of readability, program structure, maintainability and correctness. It catches over 40 common coding mistakes and gives suggestion as to coding best practice. ClearSQL can be used to do a quick syntax check on code without sending code to the server. [Shareware]

Isidian SQL Insight
A tool that enables users of an Oracle database to easily create and optimize their SQL code for application development, administration, or ad-hoc reporting. [Commercial]

ORAtool by Maximum Database Tools
Diagnostic and administration tool for Oracle, includes a PL/SQL editor in addition to facilities for monitoring and browsing database objects.

CAST SQL-Builder
PL/SQL development environment. [Commercial]

SQLGrid
An interactive query tool for Oracle developers. This is a SQL Worksheet replacement with a host of additional commands. SQLGrid provides a way to execute arbitrary SQL or PL/SQL code and also investigate how it is execute and its resource consumption. By Information Construction Company.

TimeLayer
Generates DDL and PL/SQL source for handling time varying data (temporal data), audit trail and/or change approval in a new or existing information system.

JDBExplorer
Stored procedure development tool for both PL/SQL and Java stored procedures. By Manton Computer Associates. [Free evaluation]

DreamCoder for Oracle
PL/SQL development environment that includes a debugger. Several editions available; high-end edition includes a code generator. By Mentat Technologies. [Commercial]

OraBuilder
A project tool for development of SQL and PL/SQL codes. It is designed to streamline Oracle scripts development and execution. [Commercial]

Embarcadero Technologies
Development environment for SQL and PL/SQL, with optional debugger and profiler. Includes tools for Transact-SQL, Java, HTML. [Commercial]

ocitrace
A dynamic library (.dll/.so) loaded into memory at user side it tracks all OCI calls issued by programs run at user side. [Open source, MIT License]

Benthic Software
PLEdit: a PL/SQL editor, one of several Oracle tools. [Commercial]

KeepTool
Oracle-related products include a developer's environment known as Hora, and a PL/SQL debugger. [Commercial]

Semantica Groep B.V.
Creator of various PL/SQL libraries and tools. PL/Run is a PL/SQL API solution that manages all background processes on one or more servers. PL/File offers file-, directory- and zip file functionality from within Oracle. PL/Crypt offers digest, encryption-, secure random and key generation-, and compression functionality from within Oracle. DocsDB allows to integrate document management and archiving solutions directly into applications.

SwisSQL
Oracle to Java edition helps convert Oracle PL/SQL procedures to Java. By Vembu Technologies. [Commercial]

Pl/Sql tidy
Allow tidy/beautify/format PL-SQL code in a batch file or Dos prompt. [Freeware]