jEdit is a cross-platform programmer's text editor written in Java.
Some of jEdit's features include:

* Built-in macro language (BeanShell).
* Extensible plug-in architecture with more than 80 plug-ins
available.
* Plug-ins can be downloaded and installed from within jEdit using
the plug-in manager feature.
* Syntax highlighting for more than 80 languages.
* Supports a large number of character encodings including UTF8 and
Unicode.
* Auto-indenting of source code.
* Folding (indent and marker based).
* Word wrap.
* Unlimited undo and redo.
* Highly configurable and customizable.
* Every other feature, both basic and advanced, that you would expect
to find in a text editor.