IDE's

• IntelliJ IDEA

IntelliJ IDEA is a commercial Java IDE by JetBrains.It is often simply referred to as "IDEA" or "IntelliJ."
http://www.jetbrains.com/idea/
the open-source project,IntelliJ IDEA Community Edition − the leading Java and Groovy IDE built on the IntelliJ Platform.
http://www.jetbrains.org/display/IJOS/Home;jsessionid=C0DF5F476BE68B37F78E39B78FE3FE86

• NetBeans

NetBeans refers to both a platform framework for Java desktop applications, and an integrated development environment (IDE) for developing with Java
http://netbeans.org/

• Eclipse

Eclipse is a multi-language software development environment comprising an integrated development environment (IDE) and an extensible plug-in system
http://www.eclipse.org/

• JDeveloper

JDeveloper is a freeware IDE supplied by Oracle Corporation. It offers features for development in Java, XML, SQL and PL/SQL, HTML, JavaScript, BPEL and PHP
http://www.oracle.com/technetwork/developer-tools/jdev/overview/index.html

• Borland JBuilder X

Borland® JBuilder® X Enterprise is a comprehensive set of award-winning visual development tools for creating enterprise-scale applications written entirely in the Java™ programming language for the Java™ 2 Enterprise Edition (J2EE™) platform.
http://www.embarcadero.com/products/jbuilder
http://www.borland.com/fr/products/jbuilder/

• IBM Rational Application Developer for WebSphere Software

IBM RAD,Eclipse with WAS add-ons)

Helps Java™ developers rapidly design, develop, assemble, test, profile and deploy high quality Java/Java EE ™, Portal, Web/Web 2.0, OSGi, Web services and SOA applications.
http://www-01.ibm.com/software/awdtools/developer/application/

• The Jython Project

PyDev is a Python IDE for Eclipse, which may be used in Python, Jython, and IronPython development

http://www.jython.org

• The Spring Tool Suite

Eclipse with Spring add-ons
The Spring Tool Suite™ (STS) provides the best Eclipse-powered development environment for building Spring-powered enterprise applications.
STS supplies tools for all of the latest enterprise Java and Spring, and comes on top of the latest Eclipse releases.
http://www.springsource.org/sts