react-markdown-editor (GitHub: jrm2k6/react-markdown-editor, License: MIT, npm: react-markdown-editor) by Jeremy Dagorn is a React/Reflux Markdown editor. It's designed to work with Bootstrap and Font Awesome, and there's a demo that has buttons for bold, italic, headers, and sub-headers.
MarkdownEditor component expects one prop,
initialContent, and you can listen for changes on
MarkdownEditorContentStore. Markdown processing is handled by markdown-js.
Given an array of strings, it's very easy to drop into a project, but you can also use it with components instead of strings. The props are exactly the ones I needed for my project (
onTagRemove). I heavily modified the CSS, but the example CSS looks great.
It comes with tests written using Mocha, and it's easy to install from npm or Bower.