Text Editors Open Source
You have found the way to Open Source on Text Editors:
Java Outline Editor - A folding editor written in Java. [BSD]
JE, Just an Editor - Ordinary ASCII editor written entirely in Java. Though it is incomplete yet, it has already features you won't find easily in another editor. In general, it is a multi-file ASCII editor with syntax highlighting, which provides a graphical user interface. [GPL]
jEdit - Programmer's text editor written in Java, using JDK 1.1 and Swing 1.1. [GPL]
Jext - Free java text editor. It is mainly designed for programmers and provides powerful features in a nice GUI. [GPL]
KORAIS - Editor and Email application for ancient languages (Ancient Greek, Coptic, Aramaic, Hieroglyphic Egyptian, Luwian and others). Supporting Unicode. [GPL]
PlEd - A text editor with plugins support. [GPL] Help build the largest human-edited directory on the web.