CKEditor - Real-time collaborative future-ready rich text editor
Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber
TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
Textile - Textile is a lightweight markup language originally developed by Dean Allen and billed as a...
Aloha Editor - Aloha Editor is an HTML5 WYSIWYG Editor that gives you a total new experience when editing.
Typora - A minimal Markdown reading & writing app.