Open Source IDEs in Java

Free Java IDE for beginners and teaching. Interactive evaluation; used worldwide; source on GitHub (BlueJ-Greenfoot).

IDE and tooling platform: Java, PHP, HTML5, CSS, more. Apache NetBeans; cross-platform; extensible.

Programmer's text editor: macros, plugins, 200+ languages, UTF-8. Extensible; plugin manager; runs on Java-supported platforms.

Lightweight Java IDE for students: interactive evaluator (REPL), intuitive UI. Maintained by Rice University JavaPLT; BSD.

Extensible IDE and tool platform; Java, C/C++, PHP, and more via plugins. Eclipse Foundation; RCP for custom applications.

Small Java IDE: editor, compile/run, JDK 5/1. 4/1. 2 support, JDK 6 debug tools.

GPL Java text editor; Java 1. 5+. From Armed Bear project; Lisp/ABCL integration, macros, multiple modes.

Prepackaged Eclipse distributions with selected plugins (Java, LAMP, PHP, Ruby, Python, C/C++). Passed to new owner in 2014.