MediumEditor - MediumEditor is a simple inline editor toolbar built with JavaScript.
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
Trix - A rich text editor for everyday writing.
The up-goer five text editor - A tool to track your use of the top 1000 most popular words
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.
Left - A minimalist multi-platform text editor