Markdown Edit is a simple but useful desktop markdown editor that puts the emphasis on content and keyboard shortcuts rather than fluff.
Markdown Edit doesn't have any non-essential functions, and the UI is very straightforward with most functions being accessed straight through keyboard shortcuts. There is no main menu, status bar, tabbed windows or other distractions.
Markdown is a plain text format intended for writing structured documents, based on conventions used for indicating formatting in email and Usenet posts and will allow you to open .html and .docx (Microsoft Word) files which are then converted to Markdown automatically. It fully supports drag n' drop for the opening of files as well as uploading images to Imgur. Additionally, you can utilize multiple keyboard shortcuts for frequently entered items.