Supported Editors Matrix

The Wysiwyg module currently supports the following editors: CKeditor; EpicEditor; FCKeditor; jWYSIWYG; markItUp; NicEdit;  TinyMCE;  Whizzywig; WYMeditor.

Note: Only CKEditor 4 and TinyMCE 4 will be supported after May 2022!

CKeditor (4)

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.

Drupal 8 ships with an integration of CKEditor out of the box, without the need for Wysiwyg module.

* Note if you are using CKEditor make sure you install the full package as not all plugins work with the standard package. If you prefer to stick to the latest release that has been tested with Wysiwyg, there is a problem that the CKEditor site does not (as far as I can see) offer the full package of an older release. You could try this pattern http://download.cksource.com/CKEditor/CKEditor/CKEditor%20VERSION/ckeditor_VERSION_full.zip (VERSION= e.g. 4.6.1) or this site for an archive of older full releases.

CKEditor below version 4 will not be supported after May 2022.

TinyMCE (4)

LGPL. Their file and image management addons cost money. Use Wysiwyg image uploader or IMCE. TinyMCE competes with CKEditor for the most buttons on the toolbar.

Warning, jquery > 8 may cause problems.

TinyMCE below version 4 will not be supported after May 2022.

ANYTHING BELOW HERE IS CONSIDERED DEPRECATED AND WILL NOT BE SUPPORTED AFTER MAY 2022!

FCKeditor

No longer developed in favor of CKEditor. Used to be the 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. No longer developed in favor of CKEditor.

jWYSIWYG

GPL 2 license. Wysiwyg no longer supports the latest versions due to lack of interest in the editor. 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

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.

NicEdit

MIT License. Appears to no longer be developed.
Announcement at their site onJune 6th, 2012

Note: this project is not actively developed anymore

openWYSIWYG

LGPL Open Source license.
The editor appears to no longer be developed and will not run correctly in most modern browsers.
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. :-(

Ueditor (百度编辑器)

UEditor (百度编辑器) is Baidu web front-end R & D department developed WYSIWYG rich text web editor, with a lightweight, customizable, and focus on user experience and other characteristics, the open source BSD license, allowing free use and modify the code.
Project page at https://www.drupal.org/project/ueditor

NOTE: This is editor is not officially supported by Wysiwyg module itself.

WYMeditor

For the XML puritans. No fonts or anything. You define the CSS then your editors use your classes. Development moved to Github, the old website appears to no longer be maintained.

YUI editor

Yahoo killed YUI on August 29, 2014.

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.
YUI 2 is no longer being developed and was replaced by YUI 3 (which in turn is now dead). However, the editor component in YUI 3 is more of a framework for building your own editor from scratch, which is out of scope for Wysiwyg module.

Multiple editors

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 existing entry in Wysiwyg and select another editor.

Uploading images via an editor

Media

The Media module (7.x-2.x) has a media_wysiwyg submodule which offers a plugin for adding a "Media" button and embedding documents/photos into the editor from any of its media sources (upload, library, web link, etc). 215000 sites report using Media module.
Currently only known to support CKEditor and TinyMCE.

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.

Insert

Insert works by leveraging an Image Field. It also offers Image Styles integration.