A WYSIWYG HTML editor component that embeds into a HTML form [Commercial, with free developer edition that requires a valid email for download].

Cross-browser WYSIWYG editor that currently supports IE 5.5+ and Mozilla 1.3b+ that offers a working demo. Needs OOHForms working with PHPLib [Open Source, LGPL].

Rich WYSIWYG editor that does advanced work with images, tables, FLASH, text while mataining cross-browser compatibility (MSIE 5.5+, Mozilla 1.4+) [Commercial].

Open source WYSIWYG component that can replace all textarea fields in every module for PostNuke, eNvolution and similar CMSes (core and 3rd-party). Only works for MSIE 5.5 SP1+ under Windows [Open source, GPL].

Full-featured, fully customizable, multilanguage, skinable web based WYSIWYG HTML editor control. PHP and ASP .NET versions available. IE 5.5+ required, other browsers see just a plain textarea [Open Source, GPL].

Toko Content Editor is a free multi language and multi-user web editor. Commercial version also available.