A free ASP.NET control written in C# implimenting MSHTML in Internet Explorer. It can be validated using standard ASP.NET validators and has many options for customization. Please purchase one of the following fine products if you will need support (RichTextBox, soEditor, HTML TextBox, ActivEdit, Rich Content Editor. Please see this page for a complete list of other editors).
http://www.revjon.com/ftb/