...StackEdit can sync your files with Google Drive, Dropbox and GitHub. It can also publish them as blog posts to Blogger, WordPress and Zendesk. You can choose whether to upload in Markdown format, HTML, or to format the output using the Handlebars template engine.
A jQuery plugin for file uploading using ajax(a sync); includes support for queues, progress tracking and drag and drop. Very configurable and easy to adapt to any Frontend design, and very easy to work along side any backend logic. The focus will be modern browsers, but also providing a method to know when the plugin is not supported. The idea is to keep it simple and lightweight.