Eclipse Object Teams adds new dimensions of modularity for extreme re-use while sustaining a crisp architecture that's a breeze to maintain during long-term software evolution. — This is done by extending object oriented programming with the concept of Roles which are grouped into Teams. — The Object Teams Development Tooling supports efficient development using OT/J by seamlessly and comprehensively extending JDT.
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.