WYSIWYG

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An Embeddable JavaScript Markdown Editor http://oscargodson.github.com/EpicEditor/

EpicEditor - An embeddable JavaScript Markdown editor

WYSIWYG (What You See Is What You Get) and Rich text editor can be easily found in CMS (Content Management System, such as Drupal, WordPress, Joomla etc).

10 Feature-Packed Javascript WYSIWYG And Rich Text Editors

http://www.queness.com/post/10363/10-feature-packed-javascript-wysiwyg-and-rich-text-editors