Eclipse Java Development Tools (JDT)

 The Eclipse Platform is an open and extensible platform for anything and yet
 nothing in particular. It provides a foundation for constructing and running
 integrated software-development tools. The Eclipse Platform allows tool
 builders to independently develop tools that integrate with other people's
 tools so seamlessly you can't tell where one tool ends and another starts.
 .
 This package provides Java Development Tools, a complete and powerful Java IDE
 along with several editors, a refactoring engine, Ant and JUnit integration,
 debugger, and many more features.