CKEditor - Real-time collaborative future-ready rich text editor
Aloha Editor - Aloha Editor is an HTML5 WYSIWYG Editor that gives you a total new experience when editing.
TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
WYMeditor - WYMeditor is a web-based WYSIWYM (What You See Is What You Mean) XHTML editor (not WYSIWYG).
Quill - Powerful, API-driven rich text editor
Setka Editor - Setka Editor enables users to design and create content.