From Robert Futrell:
RSyntaxTextArea is a syntax highlighting text component for Java Swing. It extends JTextComponent so it integrates completely with the standard javax.swing.text package. It can be used in any application that needs to edit or view source code. RSyntaxTextArea was originally part of the RText programmer's text editor, but is currently being made into a separate component, reusable in any Swing application.
What's new in this version:
Version 2.0.7 includes a number of bug fixes and performance improvements.