FCKeditor - best free text editor for your ASP.Net web site

This HTML text editor brings to the web much of the power of desktop editors like MS Word. It's lightweight and doesn't require any kind of installation on the client computer.

Multi browser compatibility
Outputs XHTML 1.0
CSS support for better integration with your web site
Font formatting: type, size, color, style, bold, italic, etc
Text formatting: alignment, indentation, bullets list, etc
Cut, Paste, and Paste as Plain Text, Undo and Redo
Paste from Word cleanup with auto detection
Link and anchors support
Image insertion, with upload and server browsing support
Table creation and editing (add, delete rows, etc) - one of the best systems on the market.
Table cells editing (size, colors, etc)
Form fields
Right click context menus support
Complete toolbar customization
Skins support
Plugins support
Spell checker
Multi-language support with automatic user language detection. Including Right to Left scripting.
Complete page editing HTML or just contents.
Lightweight and fast
Automatic browser detection and customization
Integration with ASP, ASP.NET, Java, ColdFusion, Perl, PHP, JavaScript and more.
Image and file links upload and server repository browser.
For web developers it is easy to install and customize
For web users it's simple and easy to use!

More...

http://www.fckeditor.net/