MediumEditor - MediumEditor is a simple inline editor toolbar built with JavaScript.
Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
Trix - A rich text editor for everyday writing.
Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.
Grammarly - Clear, effective, mistake-free writing everywhere you type.