CKEditor - Real-time collaborative future-ready rich text editor
Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber
Aloha Editor - Aloha Editor is an HTML5 WYSIWYG Editor that gives you a total new experience when editing.
txt2tags - It reads a text file with minimal markup such as **bold** and //italic// and converts it to the...
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
Texy! - Texy! is a lightweight markup language as well as converter of this format to XHTML, in a form of a...