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.
Adobe Contribute - The all-new update to Adobe Captivate (2019 release) offers ease to beginners and speed to professionals for creating all kinds of mobile-ready courses in minutes
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber