Cross-platform, multi-language IDE with syntax highlighting, code completion, and automatic Makefile generation. [Open Source, GPL]
Integrated Development Environment for Java, written in Java itself. It provides syntax highlight, automatic code completition, edit-compile-execute cycle. It require JDK 1.4. [Open source]
Programmer's text editor; includes support for dynamic download and installation of new plugins from a central plug in server. Java, XML and JSP source are well supported.
Fully-featured Java IDE written completely in Java, with many modules available, such as: debugger, form editor, object browser, CVS, emacs integration, scripting support, make, Ant, and unit testing. [Open Source, MPL-like]
The successor to the Gwydion Sheets project. It is a code editor with advanced navigational features for Object Oriented languages, currently supporting Java and XML. [Open Source, MPL]