PunyMCE is a lightweight rich text editor written in javascript. It's designed to be used for things like comments and forums.

Features

• Lightwight (9kb gzipped, 16kb minified)
• XML output. (Easy to parse on server).
• Plugin support. Comes with 11 plugins.
• BBCode output. (Requires a plugin).
• Internationalization support.
• Flexible API. Easy to extend and add things.
• Crossplatform. (IE, Firefox, Safari, Opera)
• Library independent. (9kb is all you need)

Demostration

There are live examples on the MoxieForge site that you can play with.