The currently supported editors are CKeditor, FCKeditor, jWYSIWYG, markItUp, NicEdit, openWYSIWYG, TinyMCE, Whizzywig, WYMeditor, and YUI editor.
The CKeditor is FCKeditor version 3 and, by some reports, makes FCKeditor look like a snail with arthritis. Distributed under the same licenses as FCKeditor.
Biggest baddest editor. Every feature you can think of plus the kitchen sink. Version 3 is called CKEditor so spam killers will not reject the FCK bit. Distributed under the GPL, LGPL and MPL open source licenses.
GPL 2 license.
This plugin is an inline content editor to allow editing rich HTML content on the fly. It's an alternative to WYMeditor with much less features. With a small file size less than 26Kb total and only 18Kb of code and 7Kb packed, the main concept is to keep it simple, not all users need font coloring or create tables, just the basic. Considering that both jWYSIWYG and WYMeditor are under heavy development and growing in size, the comparison might change by the time you read this.
markItUp is a jQuery plugin and the
Packed naked engine is only 6.5KB. Licence: MIT/GPL. Supported browsers: IE7, Safari 3.1, Firefox 2, Firefox 3. IE6 and Opera 9+ as-is.
LGPL Open Source license. Looks nice. Supported browsers include: IE 5.5+ (Windows), Firefox 1.0+, Mozilla 1.3+ and Netscape 7+. I tried this first because of support for old browsers but had to go elsewhere because I use IMCE.
The main script file is 94KB which could be a big download for remote users but it is not as bad as TinyMCE and FCKeditor. The menu bar is empty until you go into Buttons and plugins to turn on buttons. Check the Cleanup and output settings to make sure the editor does not remove any formatting you need elsewhere.
The buttons have italics instead of em and bold instead of strong. :-(
LGPL. Their file and image management addons cost money. Use Wysiwyg image uploader or IMCE. TinyMCE competes with FCKEditor for the most buttons on the toolbar. The main script file is 175KB. There is a jQuery version that is just a few percent smaller at 163KB. The editor has 34 add ons each adding a button, an image, script files, and a CSS file. If you use all the add ons, you could blow up your browser because some browsers will download only a limited number of script files (or is that CSS files (It is an IE thing)).
There are many more buttons in this editor but they still have italics instead of em and bold instead of strong.
When you open existing content in TinyMCE for the first time, TinyMCE adds a weird collection of paragraphs and breaks. Content that Drupal displays as a series of paragraphs can become one giant paragraph with breaks inserted. Drupal displays
<p>a</p><p>b</p> but TinyMCE converts it to
<p>a<br /><br />b</p>
MIT style License.
For the XML puritans. No fonts or anything. You define the CSS then your editors use your classes.
Standard and lite versions. BSD license. Nothing stands out against FCKeditor and similar editors except the BSD licence which lets you create and sell your own version.
The YUIeditor is buried in a 13.2MB download that expands to 83.7MB on disk.
You can install multiple editors and have a different editor for each Input format. Compare two editors site by side with one on Filtered HTML and the other on Full HTML. To change the editor for an input type, remove the exiting entry in Wysiwyg and select another editor.
Uploading images via an editor
IMCE Wysiwyg bridge
IMCE can connect to Wysiwyg through IMCE Wysiwyg bridge. 49844 sites currently report using this module. IMCE Wysiwyg bridge works only with TinyMCE, FCKeditor, and CKeditor. There is a Drupal 7 development version published.
WYSIWYG Image Upload
Alternately, you can install WYSIWYG Image Upload module to facilitate uploading images through any text editor handled by WYSIWYG. 2400 sites use it. No D7 version. See http://drupal.org/node/886356.