The Enablement project is intended to provide specialized support built on Data Tools Platform (DTP) core extension points and API. Enablement members can use the full range of these or any subset they see fit to provide specialized support for their particular data source. In general the PMC expects to see contributions to Enablement that demonstrate good usage of core DTP frameworks and tools, and not those of greater scope than could be reasonably allowed by a simple specialization delivery.
JDT - Java development tools
The JDT project provides the tool plug-ins that implement a Java IDE supporting the development of any Java application, including Eclipse plug-ins. It adds a Java project nature and Java perspective to the Eclipse Workbench as well as a number of views, editors, wizards, builders, and code merging and refactoring tools. The JDT project allows Eclipse to be a development environment for itself.
The JDT UI implements the user interface for the Java IDE. This includes views like Package Explorer and JUnit, the Java and properties files editors, Java search, and refactorings. Website: http://www.eclipse.org/jdt/ui/
PDE - Plugin Development Environment
The Plug-in Development Environment (PDE) provides tools to create, develop, test, debug, build and deploy Eclipse plug-ins, fragments, features, update sites and RCP products.
PDE also provides comprehensive OSGi tooling, which makes it an ideal environment for component programming, not just Eclipse plug-in development.
In PDE we do tooling, but our business is people!
The Platform defines the set of frameworks and common services that collectively make up infrastructure required to support the use of Eclipse as a component model, as a Rich Client Platform (RCP) and as a comprehensive tool integration platform.