Open Source Cross-Browser WYSIWYG Editor
Setting up openWYSIWYG is so easy, you can quickly turn any <textarea> into a powerful WYSIWYG editor with just a few simple lines of code. Packed with every rich text editing feature you need, openWYSIWYG gives you total control over formatting your text, e.g. Bold, italicize, change the color of your text, and more.
Requirements: IE 5.5+, Firefox 1.0+, Mozilla 1.3+ and Netscape 7+
License: LGPL License