Writedown ia simple markdown editor with a few buttons to help you write markdown. Write your blog in Markdown, get result in HTML. Similar to the stack exchange writing area.
Demo: https://bnjasim.github.io/writedown
(For a WYSIWYG editor, see my project: https://github.com/bnjasim/angular-rte)
Acknowledgement: The heavy lifting is done by marked.js (https://github.com/chjj/marked)